taskBar.addToToolBar(TaskBar.QUICK_LAUNCH_TOOLBAR, dropDownButton);
	public TopWindowGroup(String name, Icon icon, TaskBar tb)	{		if (tb == null)			throw new NullPointerException("No reference to the TaskBar.");		if (name == null || name.length() == 0)			throw new IllegalArgumentException("Must provide a name.");		taskBar = tb;		winSubMenu = new JMenu(name);		winSubMenu.setIcon(icon);		winSubMenu.setEnabled(false);		dropDownButton = new ToolBarButtonMenu();		taskBar.addToMenu(TaskBar.WINDOW_MENU, winSubMenu);		taskBar.addToToolBar(TaskBar.QUICK_LAUNCH_TOOLBAR, dropDownButton);		windows = new HashMap();		makeCloseAllButtons();	}