Pane.Activate Method (Word)
Activates the specified pane.
Syntax
expression .Activate
expression Required. A variable that represents a Pane object.
Example
This example splits the active window and then activates the first pane.
Sub SplitWindow()
With ActiveDocument.ActiveWindow
.SplitVertical = 50
.Panes(1).Activate
End With
End Sub