XmAddToPostFromList makes a menu accessible from more than one
widget. After a menu is once created, this function may be used to
make that menu accessible from a second widget. The process may be
repeated indefinitely. In other words, where an application would use
XmCreatePopupMenu or XmCreatePulldownMenu or their
equivalent to create a new menu identical to one that already exists,
it can use this function to reuse that earlier menu.
If menu refers to a Popup menu, then the post_from_widget
widget can now pop up the specified menu. The actual posting of the
menu occurs as it always does, either through an event handler, or the
automatic popup menu support (see the XmRowColumn(3) reference
If menu refers to a Pulldown menu, its ID is placed in the
XmNsubMenuId resource of the specified post_from_widget.
In this case, the post_from_widget widget must be either a
CascadeButton or a CascadeButtonGadget.
Note that this function manipulates the internal structures
themselves, not a copy of them.
For a complete definition of RowColumn and its associated resources, see
Specifies the ID of the RowColumn widget containing the menu (Popup or
Pulldown) to be made accessible from the widget.
Specifies the widget ID of the widget which will now be able to post
the menu specified by menu.