-Note that tool commands (and UI update events for tools) are first sent to
-the focus window within the frame that contains the toolbar. If no window within the frame has the focus,
-then the events are sent directly to the toolbar (and up the hierarchy to the
-frame, depending on where the application has put its event handlers). This allows command and UI update
-handling to be processed by specific windows and controls, and not necessarily
-by the application frame.
-