Bug 125011 [Contributions] ActionContributionItem should use text for tooltip in toolitems
If an action is added to a toolbar, and it has a name, but no tooltip set, the name should be used as the tooltip (except when the text is actually displayed on the toolitem using setText()) Clients sometimes forget to set the tooltip text when no specific tooltip message exists.
bundles/org.eclipse.jface/src/org/eclipse/jface/action/ActionContributionItem.java
*/
    private Listener getMenuItemListener() {
        if (menuItemListener == null) {
            menuItemListener = new Listener() {
                public void handleEvent(Event event) {
                    switch (event.type) {
                    case SWT.Dispose:
                        handleWidgetDispose(event);
                        break;
                    case SWT.Selection:
                        Widget ew = event.widget;
                        if (ew != null) {
                            handleWidgetSelection(event, ((MenuItem) ew)
                                    .getSelection());
                        }
                        break;
                    }
                }
            };
        }
        return menuItemListener;
    }
    /**
     * Returns the presentation mode, which is the bitwise-or of the 
     * <code>MODE_*</code> constants.  The default mode setting is 0, meaning
     * that for menu items, both text and image are shown (if present), but for
     * tool items, the text is shown only if there is no image.
     * 
     * @return the presentation mode settings
     *