To create an event procedure that is executed when the Resize event occurs, set the OnResize property to [Event Procedure], and click the Build button.
Private Sub Form_Resize( )
To repaint the screen every time a form is resized, use the Repaint method in a Resize event procedure.
You can’t cancel the Resize event.
Resize Event — Macros.
The following example shows how a Resize event procedure can be used to repaint a form when it is maximized. When the user clicks a command button labeled “Maximize,” the form is maximized and the Resize event is triggered.
To try this example, add the code to the Declarations section of a module for a form called Contacts that contains a command button named Maximize.
Private Sub Maximize_Click()
DoCmd.MaximizeSub
Sub Form_Resize()
Forms!Contacts.RepaintSub