ComboBox Scroll with Mouse wheel

D

DarkGlobus1OO

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Joined
Sep 28, 2017
Messages
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i tried to work with peter Peter Thornton (Excel MVP 2008-13) code which works amazing for userform Comboxes and listboxes but im a vba noobie and i cant seem to understand how to make this code work for a regular ComboBox on a worksheet

Module Code:
Code: 
'Enables mouse wheel scrolling in controls
Option Explicit


#If Win64 Then
    Private Type POINTAPI
       XY As LongLong
    End Type
#Else
    Private Type POINTAPI
           X As Long
           Y As Long
    End Type
#End If


Private Type MOUSEHOOKSTRUCT
    Pt As POINTAPI
    hWnd As Long
    wHitTestCode As Long
    dwExtraInfo As Long
End Type


#If  VBA7 Then
    Private Declare PtrSafe Function FindWindow Lib "user32" _
                                            Alias "FindWindowA" ( _
                                                            ByVal lpClassName As String, _
                                                            ByVal lpWindowName As String) As Long ' not sure if this should be LongPtr
    #If  Win64 Then
        Private Declare PtrSafe Function GetWindowLongPtr Lib "user32" _
                                            Alias "GetWindowLongPtrA" ( _
                                                            ByVal hWnd As LongPtr, _
                                                            ByVal nIndex As Long) As LongPtr
    #Else
        Private Declare PtrSafe Function GetWindowLong Lib "user32" _
                                            Alias "GetWindowLongA" ( _
                                                            ByVal hWnd As LongPtr, _
                                                            ByVal nIndex As Long) As LongPtr
    #End  If
    Private Declare PtrSafe Function SetWindowsHookEx Lib "user32" _
                                            Alias "SetWindowsHookExA" ( _
                                                            ByVal idHook As Long, _
                                                            ByVal lpfn As LongPtr, _
                                                            ByVal hmod As LongPtr, _
                                                            ByVal dwThreadId As Long) As LongPtr
    Private Declare PtrSafe Function CallNextHookEx Lib "user32" ( _
                                                            ByVal hHook As LongPtr, _
                                                            ByVal nCode As Long, _
                                                            ByVal wParam As LongPtr, _
                                                           lParam As Any) As LongPtr
    Private Declare PtrSafe Function UnhookWindowsHookEx Lib "user32" ( _
                                                            ByVal hHook As LongPtr) As LongPtr ' MAYBE Long
    'Private Declare PtrSafe Function PostMessage Lib "user32.dll" _
    '                                         Alias "PostMessageA" ( _
    '                                                         ByVal hwnd As LongPtr, _
    '                                                         ByVal wMsg As Long, _
    '                                                         ByVal wParam As LongPtr, _
    '                                                         ByVal lParam As LongPtr) As LongPtr   ' MAYBE Long
    #If  Win64 Then
        Private Declare PtrSafe Function WindowFromPoint Lib "user32" ( _
                                                            ByVal Point As LongLong) As LongPtr    '
    #Else
        Private Declare PtrSafe Function WindowFromPoint Lib "user32" ( _
                                                            ByVal xPoint As Long, _
                                                            ByVal yPoint As Long) As LongPtr    '
    #End  If
    Private Declare PtrSafe Function GetCursorPos Lib "user32" ( _
                                                            ByRef lpPoint As POINTAPI) As LongPtr   'MAYBE Long
#Else
    Private Declare Function FindWindow Lib "user32" _
                                            Alias "FindWindowA" ( _
                                                            ByVal lpClassName As String, _
                                                            ByVal lpWindowName As String) As Long
    Private Declare Function GetWindowLong Lib "user32.dll" _
                                            Alias "GetWindowLongA" ( _
                                                            ByVal hWnd As Long, _
                                                            ByVal nIndex As Long) As Long
    Private Declare Function SetWindowsHookEx Lib "user32" _
                                            Alias "SetWindowsHookExA" ( _
                                                            ByVal idHook As Long, _
                                                            ByVal lpfn As Long, _
                                                            ByVal hmod As Long, _
                                                            ByVal dwThreadId As Long) As Long
    Private Declare Function CallNextHookEx Lib "user32" ( _
                                                            ByVal hHook As Long, _
                                                            ByVal nCode As Long, _
                                                            ByVal wParam As Long, _
                                                           lParam As Any) As Long
    Private Declare Function UnhookWindowsHookEx Lib "user32" ( _
                                                            ByVal hHook As Long) As Long
    'Private Declare Function PostMessage Lib "user32.dll" _
    '                                         Alias "PostMessageA" ( _
    '                                                         ByVal hwnd As Long, _
    '                                                         ByVal wMsg As Long, _
    '                                                         ByVal wParam As Long, _
    '                                                         ByVal lParam As Long) As Long
    Private Declare Function WindowFromPoint Lib "user32" ( _
                                                            ByVal xPoint As Long, _
                                                            ByVal yPoint As Long) As Long
    Private Declare Function GetCursorPos Lib "user32.dll" ( _
                                                            ByRef lpPoint As POINTAPI) As Long
#End  If


Private Const WH_MOUSE_LL As Long = 14
Private Const WM_MOUSEWHEEL As Long = &H20A
Private Const HC_ACTION As Long = 0
Private Const GWL_HINSTANCE As Long = (-6)
'Private Const WM_KEYDOWN As Long = &H100
'Private Const WM_KEYUP As Long = &H101
'Private Const VK_UP As Long = &H26
'Private Const VK_DOWN As Long = &H28
'Private Const WM_LBUTTONDOWN As Long = &H201
Dim n As Long
Private mCtl As Object
Private mbHook As Boolean
#If  VBA7 Then
    Private mLngMouseHook As LongPtr
    Private mListBoxHwnd As LongPtr
#Else
    Private mLngMouseHook As Long
    Private mListBoxHwnd As Long
#End  If
     
Sub HookListBoxScroll(frm As Object, ctl As Object)
    Dim tPT As POINTAPI
    #If VBA7 Then
        Dim lngAppInst As LongPtr
        Dim hwndUnderCursor As LongPtr
    #Else
        Dim lngAppInst As Long
        Dim hwndUnderCursor As Long
    #End  If
    GetCursorPos tPT
    #If  Win64 Then
        hwndUnderCursor = WindowFromPoint(tPT.XY)
    #Else
        hwndUnderCursor = WindowFromPoint(tPT.X, tPT.Y)
    #End  If
    If TypeOf ctl Is UserForm Then
        If Not frm Is ctl Then
               ctl.SetFocus
        End If
    Else
        If Not frm.ActiveControl Is ctl Then
             ctl.SetFocus
        End If
    End If
    If mListBoxHwnd <> hwndUnderCursor Then
        UnhookListBoxScroll
        Set mCtl = ctl
        mListBoxHwnd = hwndUnderCursor
        #If  Win64 Then
            lngAppInst = GetWindowLongPtr(mListBoxHwnd, GWL_HINSTANCE)
        #Else
            lngAppInst = GetWindowLong(mListBoxHwnd, GWL_HINSTANCE)
        #End  If
        ' PostMessage mListBoxHwnd, WM_LBUTTONDOWN, 0&, 0&
        If Not mbHook Then
            mLngMouseHook = SetWindowsHookEx( _
                                            WH_MOUSE_LL, AddressOf MouseProc, lngAppInst, 0)
            mbHook = mLngMouseHook <> 0
        End If
    End If
End Sub


Sub UnhookListBoxScroll()
    If mbHook Then
        Set mCtl = Nothing
        UnhookWindowsHookEx mLngMouseHook
        mLngMouseHook = 0
        mListBoxHwnd = 0
        mbHook = False
    End If
End Sub
#If  VBA7 Then
    Private Function MouseProc( _
                            ByVal nCode As Long, ByVal wParam As Long, _
                            ByRef lParam As MOUSEHOOKSTRUCT) As LongPtr
        Dim idx As Long
        On Error GoTo errH
        If (nCode = HC_ACTION) Then
            #If  Win64 Then
                If WindowFromPoint(lParam.Pt.XY) = mListBoxHwnd Then
                    If wParam = WM_MOUSEWHEEL Then
                        MouseProc = True
'                        If lParam.hWnd > 0 Then
'                            postMessage mListBoxHwnd, WM_KEYDOWN, VK_UP, 0
'                        Else
'                            postMessage mListBoxHwnd, WM_KEYDOWN, VK_DOWN, 0
'                        End If
'                        postMessage mListBoxHwnd, WM_KEYUP, VK_UP, 0
                        If TypeOf mCtl Is Frame Then
                            If lParam.hWnd > 0 Then idx = -10 Else idx = 10
                            idx = idx + mCtl.ScrollTop
                            If idx >= 0 And idx < ((mCtl.ScrollHeight - mCtl.Height) + 17.25) Then
                                mCtl.ScrollTop = idx
                            End If
                        ElseIf TypeOf mCtl Is UserForm Then
                            If lParam.hWnd > 0 Then idx = -10 Else idx = 10
                            idx = idx + mCtl.ScrollTop
                            If idx >= 0 And idx < ((mCtl.ScrollHeight - mCtl.Height) + 17.25) Then
                                mCtl.ScrollTop = idx
                            End If
                        Else
                             If lParam.hWnd > 0 Then idx = -1 Else idx = 1
                             idx = idx + mCtl.ListIndex
                             If idx >= 0 And idx <= mCtl.ListCount - 1 Then mCtl.ListIndex = idx
                        End If
                    Exit Function
                    End If
                Else
                    UnhookListBoxScroll
                End If
            #Else
                If WindowFromPoint(lParam.Pt.X, lParam.Pt.Y) = mListBoxHwnd Then
                    If wParam = WM_MOUSEWHEEL Then
                        MouseProc = True
'                        If lParam.hWnd > 0 Then
'                            postMessage mListBoxHwnd, WM_KEYDOWN, VK_UP, 0
'                        Else
'                            postMessage mListBoxHwnd, WM_KEYDOWN, VK_DOWN, 0
'                        End If
'                        postMessage mListBoxHwnd, WM_KEYUP, VK_UP, 0
                        If TypeOf mCtl Is Frame Then
                            If lParam.hWnd > 0 Then idx = -10 Else idx = 10
                            idx = idx + mCtl.ScrollTop
                            If idx >= 0 And idx < ((mCtl.ScrollHeight - mCtl.Height) + 17.25) Then
                                mCtl.ScrollTop = idx
                            End If
                        ElseIf TypeOf mCtl Is UserForm Then
                            If lParam.hWnd > 0 Then idx = -10 Else idx = 10
                            idx = idx + mCtl.ScrollTop
                            If idx >= 0 And idx < ((mCtl.ScrollHeight - mCtl.Height) + 17.25) Then
                                mCtl.ScrollTop = idx
                            End If
                        Else
                             If lParam.hWnd > 0 Then idx = -1 Else idx = 1
                             idx = idx + mCtl.ListIndex
                             If idx >= 0 And idx <= mCtl.ListCount - 1 Then mCtl.ListIndex = idx
                        End If
                        Exit Function
                    End If
                Else
                    UnhookListBoxScroll
                End If
            #End If
        End If
        MouseProc = CallNextHookEx( _
                                mLngMouseHook, nCode, wParam, ByVal lParam)
        Exit Function
errH:
        UnhookListBoxScroll
    End Function
#Else
    Private Function MouseProc( _
                            ByVal nCode As Long, ByVal wParam As Long, _
                            ByRef lParam As MOUSEHOOKSTRUCT) As Long
        Dim idx As Long
        On Error GoTo errH
        If (nCode = HC_ACTION) Then
            If WindowFromPoint(lParam.Pt.X, lParam.Pt.Y) = mListBoxHwnd Then
                If wParam = WM_MOUSEWHEEL Then
                    MouseProc = True
'                    If lParam.hWnd > 0 Then
'                    postMessage mListBoxHwnd, WM_KEYDOWN, VK_UP, 0
'                    Else
'                    postMessage mListBoxHwnd, WM_KEYDOWN, VK_DOWN, 0
'                    End If
'                    postMessage mListBoxHwnd, WM_KEYUP, VK_UP, 0
                    
                    If TypeOf mCtl Is Frame Then
                        If lParam.hWnd > 0 Then idx = -10 Else idx = 10
                        idx = idx + mCtl.ScrollTop
                        If idx >= 0 And idx < ((mCtl.ScrollHeight - mCtl.Height) + 17.25) Then
                            mCtl.ScrollTop = idx
                        End If
                    ElseIf TypeOf mCtl Is UserForm Then
                        If lParam.hWnd > 0 Then idx = -10 Else idx = 10
                        idx = idx + mCtl.ScrollTop
                        If idx >= 0 And idx < ((mCtl.ScrollHeight - mCtl.Height) + 17.25) Then
                            mCtl.ScrollTop = idx
                        End If
                    Else
                         If lParam.hWnd > 0 Then idx = -1 Else idx = 1
                         idx = idx + mCtl.ListIndex
                         If idx >= 0 And idx <= mCtl.ListCount - 1 Then mCtl.ListIndex = idx
                    End If
                    Exit Function
                End If
            Else
                UnhookListBoxScroll
            End If
        End If
        MouseProc = CallNextHookEx( _
        mLngMouseHook, nCode, wParam, ByVal lParam)
        Exit Function
errH:
        UnhookListBoxScroll
    End Function
#End  If


hope someone here can help me i have been scratching my head around this problem for days!
:confused::confused::confused::confused:
 
Last edited by a moderator:
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Sorry to bother you again. I tried it on Windows 7 - Office 2013, and the list moved only upwards, both while scrolling down or up.
Is this because of the way the different OS versions work, or is it the Office version?
 
Upvote 0

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dma431 said:
Sorry to bother you again. I tried it on Windows 7 - Office 2013, and the list moved only upwards, both while scrolling down or up.
Is this because of the way the different OS versions work, or is it the Office version?
Click to expand...

I don't know, It could well be . I'll have to test it again later on and report back.
 
Upvote 0
dma431 said:
Sorry to bother you again. I tried it on Windows 7 - Office 2013, and the list moved only upwards, both while scrolling down or up.
Is this because of the way the different OS versions work, or is it the Office version?
Click to expand...

Deleted ... will post later
 
Upvote 0
Update As per the MS Documentation :

Updated Workbook Demo


API code update in a Standard Module:
VBA Code: 
Option Explicit

' Jaafar Tribak @ MrExcel.com on 28/01/20
' Code that enables the mousewheel in vba Userform listboxes.

' USAGE:
' ------
'  Private Sub ListBox1_MouseMove(ByVal Button As Integer, ByVal Shift As Integer, ByVal x As Single, ByVal y As Single)
'      EnableMouseScroll(ListBox1) = True
'  End Sub


Private Type POINTAPI
  x As Long
  y As Long
End Type

Type RECT
    Left As Long
    Top As Long
    Right As Long
    Bottom As Long
End Type


#If VBA7 Then

    Private Type MSG
        hwnd As LongPtr
        message As Long
        Wparam As LongPtr
        lParam As LongPtr
        time As Long
        pt As POINTAPI
    End Type

    #If Win64 Then
       Private Declare PtrSafe Function WindowFromPoint Lib "user32" (ByVal Point As LongPtr) As LongPtr
    #Else
       Private Declare PtrSafe Function WindowFromPoint Lib "user32" (ByVal xPoint As Long, ByVal yPoint As Long) As LongPtr
    #End If

    Private Declare PtrSafe Function WindowFromAccessibleObject Lib "oleacc" (ByVal pacc As IAccessible, phwnd As LongPtr) As Long
    Private Declare PtrSafe Function IsWindow Lib "user32" (ByVal hwnd As LongPtr) As Long
    Private Declare PtrSafe Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length As LongPtr)
    Private Declare PtrSafe Function GetSystemMetrics Lib "user32" (ByVal nIndex As Long) As Long
    Private Declare PtrSafe Function PostMessage Lib "user32" Alias "PostMessageA" (ByVal hwnd As LongPtr, ByVal wMsg As Long, ByVal Wparam As LongPtr, ByVal lParam As LongPtr) As Long
    Private Declare PtrSafe Function PeekMessage Lib "user32" Alias "PeekMessageA" (lpMsg As MSG, ByVal hwnd As LongPtr, ByVal wMsgFilterMin As Long, ByVal wMsgFilterMax As Long, ByVal wRemoveMsg As Long) As Long
    Private Declare PtrSafe Function WaitMessage Lib "user32" () As Long
    Private Declare PtrSafe Function GetClientRect Lib "user32" (ByVal hwnd As LongPtr, lpRect As RECT) As Long
    Private Declare PtrSafe Function GetCursorPos Lib "user32.dll" (lpPoint As POINTAPI) As Long

#Else

    Private Type MSG
        hwnd As Long
        message As Long
        Wparam As Long
        lParam As Long
        time As Long
        pt As POINTAPI
    End Type

    Private Declare Function WindowFromPoint Lib "user32" (ByVal xPoint As Long, ByVal yPoint As Long) As Long
    Private Declare Function WindowFromAccessibleObject Lib "oleacc" (ByVal pacc As IAccessible, phwnd As Long) As Long
    Private Declare Function IsWindow Lib "user32" (ByVal hwnd As Long) As Long
    Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length As Long)
    Private Declare Function GetSystemMetrics Lib "user32" (ByVal nIndex As Long) As Long
    Private Declare Function PostMessage Lib "user32" Alias "PostMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal Wparam As Long, ByVal lParam As Long) As Long
    Private Declare Function PeekMessage Lib "user32" Alias "PeekMessageA" (lpMsg As MSG, ByVal hwnd As Long, ByVal wMsgFilterMin As Long, ByVal wMsgFilterMax As Long, ByVal wRemoveMsg As Long) As Long
    Private Declare Function WaitMessage Lib "user32" () As Long
    Private Declare Function GetClientRect Lib "user32" (ByVal hwnd As Long, lpRect As RECT) As Long
    Private Declare Function GetCursorPos Lib "user32.dll" (lpPoint As POINTAPI) As Long

#End If


' API consts
Private Const WM_MOUSEWHEEL = &H20A
Private Const WHEEL_DELTA = 120
Private Const WM_LBUTTONDOWN = &H201
Private Const WM_LBUTTONUP = &H202
Private Const MK_LBUTTON = &H1
Private Const SM_CXVSCROLL = 2
Private Const PM_NOREMOVE = &H0
Const LINES_PER_SCROLL = 1 '<=== (LINES_PER_SCROLL):Change scroll lines value as required

Private bMonitoringMouseWheel As Boolean
 
Public sFeedback As String


 
Public Property Let EnableMouseScroll(ByVal ListBox As Object, ByVal Enable As Boolean)

    #If VBA7 Then
        Dim hwnd As LongPtr
    #Else
        Dim hwnd As Long
    #End If

    Dim tRect As RECT, tCurPos As POINTAPI, tMsg As MSG
    Dim Low As Integer, High As Integer, i As Integer


    ListBox.SetFocus
    WindowFromAccessibleObject ListBox, hwnd
    
    If Not bMonitoringMouseWheel Then
        bMonitoringMouseWheel = True
        If Enable Then
            Call UserFeedBack("Monitoring MouseWheel Messages for : (" & ListBox.Name & ")")
            Do While IsWindow(hwnd)
                GetCursorPos tCurPos
                If IsMouseOverListBox(ListBox, tCurPos) = False Then
                    Exit Do
                End If
                WaitMessage
                If PeekMessage(tMsg, 0, WM_MOUSEWHEEL, WM_MOUSEWHEEL, PM_NOREMOVE) Then
                    GetClientRect tMsg.hwnd, tRect
                    #If Win64 Then
                        Dim lParm As LongPtr
                        If IsMouseOverListBox(ListBox, tMsg.pt) Then
                            If HighWord64(tMsg.Wparam) = WHEEL_DELTA Then
                    #Else
                        Dim lParm As Long
                        If IsMouseOverListBox(ListBox, tMsg.pt) Then
                            If HighWord32(tMsg.Wparam) = WHEEL_DELTA Then
                    #End If
                                Call UserFeedBack("MouseWheel Scrolling (Up)")
                                Low = tRect.Right - (GetSystemMetrics(SM_CXVSCROLL) / 2)
                                High = tRect.Top + ((GetSystemMetrics(SM_CXVSCROLL) / 2) + 1)
                            Else
                                Call UserFeedBack("MouseWheel Scrolling (Down)")
                                Low = tRect.Right - (GetSystemMetrics(SM_CXVSCROLL) / 2)
                                High = tRect.Bottom - ((GetSystemMetrics(SM_CXVSCROLL) / 2) + 1)
                            End If
                            lParm = MakeDWord(Low, High)
                            For i = 1 To LINES_PER_SCROLL '<=== (LINES_PER_SCROLL):Change this scroll lines Const as required
                                PostMessage hwnd, WM_LBUTTONDOWN, MK_LBUTTON, lParm
                                PostMessage hwnd, WM_LBUTTONUP, MK_LBUTTON, lParm
                            Next i
                        End If
                End If  ' PeekMessage
                DoEvents
            Loop
            bMonitoringMouseWheel = False
            Call UserFeedBack("MouseWheel Monitoring Stopped.")
        End If
    End If

End Property



Private Function IsMouseOverListBox(ByVal ListBox As Object, ByRef CusPos As POINTAPI) As Boolean

    #If VBA7 Then
        Dim hwnd As LongPtr
    #Else
        Dim hwnd As Long
    #End If
    
    WindowFromAccessibleObject ListBox, hwnd
    #If Win64 Then
        Dim lPt As LongPtr
        CopyMemory lPt, CusPos, LenB(lPt)
        If WindowFromPoint(lPt) = hwnd Then
    #Else
        If WindowFromPoint(CusPos.x, CusPos.y) = hwnd Then
    #End If
            IsMouseOverListBox = True
    End If

End Function

Private Sub UserFeedBack(ByVal Feedback As String)
    Debug.Print Feedback
    sFeedback = Feedback
End Sub

Private Function MakeDWord(ByVal loword As Integer, ByVal hiword As Integer) As Long
    MakeDWord = (hiword * &H10000) Or (loword And &HFFFF&)
End Function

Private Function HighWord32(ByVal Wparam As Long) As Integer
    CopyMemory HighWord32, ByVal VarPtr(Wparam) + 2, 2
End Function

#If Win64 Then
    Private Function HighWord64(ByVal Wparam As LongPtr) As Long
        CopyMemory HighWord64, ByVal VarPtr(Wparam) + 2, 4
    End Function
#End If
 
Upvote 0
Hello Jafaar,
Your work is amazing.
When I hover the mouse past a sheet combobox, it gives me "run-time error 438, object doesn't support this property or method."
If I click on Debug, it highlights "ListBox.SetFocus".
Also, this code works only for listboxes. Can this be combined with your previous code for comboboxes or is it too complicated?
 
Upvote 0
Nevermind. I realised the error appeared because I used both scripts at the same time, and the function names were the same. After renaming one of them the error went away.
 
Upvote 0
Hi again Jafaar. I have a little question about the up-scrolling. The selected items in my listbox are shown live on the linked cell, so if i check or uncheck an item, the cell will reflect that change right away.
Now, when I use the wheel to scroll all the way to the top of the list, for some reason the first item gets selected and deselected as I keep scrolling upwards. Is that an Excel thing or something that can be fixed in the code? Thanks for all your help.
 
Upvote 0
Same as with the code in Post#44 but applied to ComboBoxes

Workbook Demo

www.mrexcel.com

Scroll when inside "dropdown area" of combobox, not just main object - userform

I have found much help in this forum but I'm lacking the last dot of the "i". I've come across 2 different approaches to getting mousewheel scroll inside a userform. Both written by @Jaafar Tribak These are: [Alt.1] – Scroll any control [Alt.2] – Scroll ListBoxes With [Alt.1] scrolling inside...
www.mrexcel.com www.mrexcel.com
 
Upvote 0
Jaafar Tribak said:
Same as with the code in Post#44 but applied to ComboBoxes

Workbook Demo

www.mrexcel.com

Scroll when inside "dropdown area" of combobox, not just main object - userform

I have found much help in this forum but I'm lacking the last dot of the "i". I've come across 2 different approaches to getting mousewheel scroll inside a userform. Both written by @Jaafar Tribak These are: [Alt.1] – Scroll any control [Alt.2] – Scroll ListBoxes With [Alt.1] scrolling inside...
www.mrexcel.com www.mrexcel.com
Click to expand...
First of all sorry about my bad English.

Thanks for codes but i have a problem on my file.
There is no problem doing wheelup, but the list closes automatically when I do Wheeldown. I've been trying to solve it for two days, but I couldn't find where the problem was. Do you have any idea about this? Thanks in advance
 
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