If the KEEP-FRAME-Z-ORDER attribute is set to TRUE, the AVM ignores the default frame overlay behavior.
By default, the AVM moves the frame that contains the field with focus to the top. When you set the KEEP-FRAME-Z-ORDER attribute to TRUE, you are responsible for maintaining the overlay order of the frames using the MOVE-TO-TOP( ) and MOVE-TO-BOTTOM( ) methods. You should always set this attribute to TRUE when you use the MOVE-TO-TOP( ) and MOVE-TO-BOTTOM( ) methods.