Vaadin 7 button remove parent window

Vaadin 6 / 7 / 8
1

Hi,

Vaadin in 6 I can remove the parent windows of a button as shown below

Button apply = new Button(“Close”, new Button.ClickListener() {
public void buttonClick(ClickEvent event) {

Window w = getWindow();
getApplication().removeWindow(w);
}
});

how can I do this in Vaadin 7 vaadin 7 alpha 1?

Thanks.