Bug 157072 [ActionSets][Contributions] QuickMenuAction funtionality should be made public
The QuickMenuAction class should be made public and usable by IWorkbenchWindowPulldownDelegate{2}. As it is you need to roll this functionality yourself in the run method of your delegate (and it is by no means straightforward).
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/actions/QuickMenuAction.java
*/
    public void run() {
        Display display = Display.getCurrent();
        if (display == null) {
			return;
		}
        Control focus = display.getFocusControl();
        if (focus == null || focus.isDisposed()) {
			return;
		}
        MenuManager menu = new MenuManager();
        fillMenu(menu);
        if (quickMenu != null) {
            quickMenu.dispose();
            quickMenu = null;
        }
        quickMenu = menu.createContextMenu(focus.getShell());
        Point location = computeMenuLocation(focus, quickMenu);
        if (location == null) {
			return;
		}
        quickMenu.setLocation(location);
        quickMenu.setVisible(true);
    }
    public void dispose() {
        if (quickMenu != null) {
            quickMenu.dispose();
            quickMenu = null;
        }
    }