Would something like this work? This will hide/make invisible the parent Excel Application while the UserForm is displayed. Or at least get you started:
Example subroutine that "Shows" the userform:
Sub Test()
Dim ppt As Object
Dim xl As Object
Set ppt = GetObject(, "PowerPoint.Application")
Application.Visible = False
UserForm1.Show vbModeless
End Sub
Use this in the form's Terminate
event:
Private Sub UserForm_Terminate()
'Ensures the Excel Application is visible after the form closes
Application.Visible = True
End Sub
You could add a button/etc on the form, if you want to allow the user to unhide the Excel Application
Private Sub CommandButton1_Click()
'Displays the Excel Application:
Application.Visible = True
End Sub