Hiding and unhiding buttons in "add ins" on ribbon

[Richard U]

I've used the commandbar to create and remove buttons....

Sub AddNewCB()
   Dim myCommandBar As CommandBar, myCommandBarCtl As CommandBarControl
   On Error GoTo AddNewCB_Err
   Set myCommandBar = CommandBars.Add(Name:="MY_LIST", Position:=msoBarFloating, MenuBar:=False, Temporary:=True)
   myCommandBar.Visible = True

   Set myCommandBarCtl = myCommandBar.Controls.Add(Type:=msoControlButton)
   With myCommandBarCtl
      .Style = msoButtonCaption
      .Caption = "Load File  "
      .OnAction = "'LoadFile'"
   End With
   Set myCommandBarCtl = myCommandBar.Controls.Add(Type:=msoControlButton)
   With myCommandBarCtl
      .Style = msoButtonCaption
      .Caption = "Make ABC   "
      .OnAction = "'Make_ABC"
   End With
   Set myCommandBarCtl = myCommandBar.Controls.Add(Type:=msoControlButton)
   With myCommandBarCtl
      .Style = msoButtonCaption
      .Caption = "Make DEF  "
      .OnAction = "'Make_DEF'"
   End With
   Exit Sub

   Set myCommandBarCtl = myCommandBar.Controls.Add(Type:=msoControlButton)
   With myCommandBarCtl
      .Style = msoButtonCaption
      .Caption = "Export file"
      .OnAction = "Export_File"
   End With
   Exit Sub


AddNewCB_Err:
   Debug.Print Err.Number & vbCr & Err.Description
   Exit Sub
End Sub


Sub RemoveToolbar()
    Dim myCommandBar As CommandBar
    For Each myCommandBar In Application.CommandBars
        If myCommandBar.Name = "LOAD_LIST" Then
            myCommandBar.Delete
            Exit For
        End If
    Next
End Sub

What I want to do is hide buttons as they don't apply. I don't want "Export file" to be visible until I make either ABC or DEF, and after I pick ABC or DEF, I want to hide the one that I don't pick.

How can I do this

(I HATE THIS @#$@^**!!! RIBBON)