XmAddToPostFromList — a RowColumn function that makes a menu
accessible from more than one widget

     #include <Xm/RowColumn.h>

void XmAddToPostFromList(
Widget menu,
Widget post_from_widget);

     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 page).

     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.

menu      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.

     For a complete definition of RowColumn and its
associated resources, see XmRowColumn(3).

     XmGetPostedFromWidget(3), XmRemoveFromPostFromList(3),
and XmRowColumn(3).