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 menus list of widgets permitted to post that
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.
For a complete definition of RowColumn and its associated resources, see
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..