XmGetFocusWidget - Returns the ID of the widget that has keyboard focus
Widget XmGetFocusWidget (widget)
XmGetFocusWidget examines the hierarchy that
contains the specified widget and returns the ID of the widget that has keyboard
focus. The function extracts the widget ID from the associated Shell widget;
therefore the specified widget can be located anywhere in the hierarchy.
Specifies a widget ID within a given hierarchy
Returns the ID of the widget with keyboard focus. If no child of the
Shell has focus, the function returns NULL.