Here is a quick little post outlining how to create a minimize/maximize event routine.
Add the following code to a class named EventClassModule
Public WithEvents App As Word.Application
Private Sub App_WindowDeactivate(ByVal Doc As Document, ByVal Wn As Window)
If Doc.ActiveWindow.WindowState = wdWindowStateMinimize Then
'you code in here
End If
End Sub
and then add the following code under ThisDocument
Dim X As New EventClassModule
Private Sub Document_Open()
'Call Register_Event_Handler
Set X.App = Word.Application
End Sub