Refreshing the ribbon interface before a call from a macro

[ElmerCC]

When creating custom ribbons, at some points in the application I need to be able to enable and or disable the button commands.
Here is the specific portion of the ribbon script:

<customUI xmlns="http://schemas.microsoft.com/office/2009/07/customui" onLoad="OnMainLoad"> 
  <ribbon startFromScratch="false"> 
    <tabs> 
      <tab id="CustomTab" label="Refresh-Ribbon">
    <group id="Group1" label="Problema"> 
        <button id="Button1" 
                   label="Run" 
                   imageMso="RecordingPlay" 
                   size="large" 
                   onAction="Run_OnAction"
             getEnabled="Button_GetEnabled"/> 
        <button id="Button2" 
                   label="Pause" 
                   imageMso="PauseSharedSpace" 
                   size="large" 
                   onAction="Pause_OnAction"
             getEnabled="Button_GetEnabled"/> 
    </group>     
      </tab> 
    </tabs> 
  </ribbon> 
</customUI>

The problem is that I can't get the ribbon to refresh before of call macro main to enable the Pause Button

Public MyRibbonUI As IRibbonUI
Public EnabledButton1 As Boolean
Public EnabledButton2 As Boolean
Public run As Boolean
Public pause As Boolean

Public Sub OnMainLoad(ribbon As IRibbonUI)
    Set MyRibbonUI = ribbon
    run = False
    pause = False
    EnabledButton1 = True
    EnabledButton2 = False
End Sub

Public Sub Button_GetEnabled(control As IRibbonControl, ByRef Enabled)
    Select Case control.ID
        Case "Button1"
            Enabled = EnabledButton1
        Case "Button2"
            Enabled = EnabledButton2
    End Select
End Sub

Public Sub Run_OnAction(Button As IRibbonControl)
    EnabledButton1 = False
    EnabledButton2 = True
    MyRibbonUI.InvalidateControl ("Button1")
    MyRibbonUI.InvalidateControl ("Button2")
    'Refreshing the ribbon interface before of call Main
    If run = False And pause = False Then
        run = True
        Call Main
    ElseIf run = True And pause = True Then
        pause = False
    End If
End Sub

Sub Pause_OnAction(Button As IRibbonControl)
    pause = True
    EnabledButton1 = True
    EnabledButton2 = False
    MyRibbonUI.InvalidateControl ("Button1")
    MyRibbonUI.InvalidateControl ("Button2")
    'Refreshing the ribbon interface
End Sub

Public Sub Main()
    i = 1
    Do While run
        Cells(1, 1) = i
        i = i + 1
        DoEvents
        If pause Then
            Call Wait
        End If
    Loop
End Sub

Sub Wait()
    If pause Then
        Do
           DoEvents
        Loop Until Not pause
    End If
End Sub