How get reference to main window

Hi I've decided to develop my first component form eclipse plugin .Code is litte bit changed to handle my own message. Question is how to get refernce to mainWindow I want to add new window after click. All info i have found is linked to Application not the widget.

public class Box extends AbstractComponent {

	private String message;
	private int clicks = 0;
	public Box(String m){
		this.message = m;
	}
	@Override
	public void paintContent(PaintTarget target) throws PaintException {
		super.paintContent(target);

		// Paint any component specific content by setting attributes
		// These attributes can be read in updateFromUIDL in the widget.
		target.addAttribute("clicks", clicks);
		target.addAttribute("message", message);

		// We could also set variables in which values can be returned
		// but declaring variables here is not required
	}
	@Override
	public void changeVariables(Object source, Map<String, Object> variables) {
		super.changeVariables(source, variables);

		if (variables.containsKey("click")) {
			clicks++;
			message += "<br/>" + variables.get("click");
			requestRepaint();
		}
	}
}

public class VBox extends Widget implements Paintable, ClickHandler {


	public static final String CLASSNAME = "v-box";
	public static final String CLICK_EVENT_IDENTIFIER = "click";
	protected String paintableId;
	protected ApplicationConnection client;
	public VBox() {
		setElement(Document.get().createDivElement());
		setStyleName(CLASSNAME);
		sinkEvents(Event.ONCLICK);
		addDomHandler(this, ClickEvent.getType());
	}
	public void updateFromUIDL(UIDL uidl, ApplicationConnection client) {
		if (client.updateComponent(this, uidl, true)) {
			return;
		}
		this.client = client;
		paintableId = uidl.getId();
		int clicks = uidl.getIntAttribute("clicks");
		String message = uidl.getStringAttribute("message");
		getElement().setInnerHTML("After <b>"+clicks+"</b> mouse clicks:\n" + message);
	}
     public void onClick(ClickEvent event) {
		String button = "left click";
		client.updateVariable(paintableId, CLICK_EVENT_IDENTIFIER, button, true);
	}
}

public class El_6Application extends Application {
	private static final long serialVersionUID = -7939428060094466420L;
	
	@Override
	public void init() {
		Window mainWindow = new Window("MyAppt");
		setTheme("el_6theme");
		setMainWindow(mainWindow);
		mainWindow.setImmediate(true);
		Box a = new Box("message");
		mainWindow.addComponent(a);
	}
}

Ok i found the solution :P:

public class Box extends AbstractComponent {
	[b]Window myWindow; // The window to be opened[/b]
	private String message;
	private int clicks = 0;

	public Box(String m){
		this.message = m;
	}
	@Override
	public void paintContent(PaintTarget target) throws PaintException {
		super.paintContent(target);
		target.addAttribute("clicks", clicks);
		target.addAttribute("message", message);

		// We could also set variables in which values can be returned
		// but declaring variables here is not required
	}
	@Override
	public void changeVariables(Object source, Map<String, Object> variables) {
		super.changeVariables(source, variables);

		// Variables set by the widget are returned in the "variables" map.

		if (variables.containsKey("click")) {
			[b]myWindow = new Window("A subwindow");
			getWindow().addWindow(myWindow);[/b]
			clicks++;
			message += "<br/>" + variables.get("click");

			requestRepaint();
		}
	}

}