setVisibleRect makes image vanish :?

[darkflame]

If I make a class like;

public class CroppedImageSet extends SimplePanel {

        final Image Background = new Image("");

        public TransitionGridImage(){

                this.add(Background);
                Background.setUrl("http://www.google.com/images/logo.gif";);

                Background.addClickListener(new ClickListener() {
                      public void onClick(Widget sender) {
                          Background.setVisibleRect(0, 0, 50, 50);
                      }
                    });

        }

        public void Show(){

                RootPanel.get().add(this,0,0);

        }

}


Then click the picture, the image vanish's, rather then gets cropped.
(IE6, hosted mode)
Can anyone explain why :?

Probably missing something obvious here, but I just cant see it.

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