Determines whether or not the Undo Event will be suppressed for the dialog element. If it is suppressed, the event handler will not get control when the dialog element has the keyboard focus and a menu or toolbar item with a MENU-ITEM-TYPE of MT-EDITUNDO is clicked.

Applies to	ActiveX control, list box control, list view control, tree view control.
Data Type	I4
Default Value	1 (SUPPRESSED)
Possible Values	0 (NOT-SUPPRESSED) / 1 (SUPPRESSED)

Note:
You can use the symbols SUPPRESSED and NOT-SUPPRESSED defined in the local data area NGULKEY1. NGULKEY1 is automatically included in your application.