Xmremovefrompostfromlist a rowcolumn function that disables a menu for a particular widget "xmremovefrompostfromlist" "rowcolumn functions" "xmremovefrompostfromlist"
#include <Xm/RowColumn.h> void XmRemoveFromPostFromList( Widget menu, Widget post_from_widget);
XmRemoveFromPostFromList makes a Popup or Pulldown menu no longer accessible from a widget. This function does not destroy a menu, or deallocate the memory associated with it. It simply removes the widget from the menu's list of widgets permitted to post that menu.
If the menu argument refers to a Popup menu, the event handlers are removed from the post_from_widget widget. If the argument refers to a Pulldown menu, its ID is removed from the XmNsubMenuId of the specified post_from_widget. Also, if the menu is a Pulldown menu, the post_from_widget widget must be either a CascadeButton or a CascadeButtonGadget.
Specifies the widget ID of a the Popup or Pulldown menu to be made inaccessible from the post_from_widget widget.
Specifies the widget ID of the widget which can no longer post the menu referred to by the menu argument..
For a complete definition of RowColumn and its associated resources, see XmRowColumn(3).