sub window always on top

Hi,
It is possible to add a sub window and make it to be always on top refering to other sub window?


Window mainWindow;
Window subWindow1;
Window subWindow2;

public void init() {
	mainWindow = new Window("Example");
	mainWindow.setSizeFull();
	setMainWindow(mainWindow);
	
	/** First Sub Window */
	subWindow1 = new Window("Sub Window 1");
	subWindow1.center();
	
	/** Second Sub Window */
	subWindow2 = new Window("Sub Window 2");
	subWindow2.center();
	
	mainWindow.addWindow(subWindow1);
	
	mainWindow.addWindow(subWindow2);
}

Like this example, make subWindow2 to be always on top even when dragging subWindow1?