Scrollbar appears regardless Overflow.HIDDEN

[stanleyxu2005]

SmartClient Version: v8.3_2012-11-20/LGPL Development Only (built 2012-11-20)
GWT Version: 2.5
Browser: Firefox 18.0.2

I simply created a window with a Layout component. The window has scrollbars regardless the overflow setting has already been set to HIDDEN.

public class HelloWorld implements EntryPoint {
    public void onModuleLoad() {
        Window win = new Window();
        win.setShowEdges(false);
        win.setShowTitle(false);
        win.setShowHeader(false);
        win.setAutoCenter(true);
        win.setWidth(500);
        win.setHeight(500);
        win.setOverflow(Overflow.HIDDEN);

        VLayout container = new VLayout();
        container.setWidth(500);
        container.setHeight(500);
        container.setOverflow(Overflow.HIDDEN);
        container.setLayoutMargin(3);

        win.addItem(container);
        win.show();
    }
}

Dear developers, is this a bug or how can I get rid off the scrollbars?

Note that I do not have this issue while using smartgwt 2.1 plus gwt 2.0.

[stanleyxu2005]

Note that I do not have this issue while using smartgwt 2.1 plus gwt 2.0.

After having called "win.setAutoSize(true)" the scrollbars go away. Should autosize be set to true by default, shouldn't it?