gxt window on top of two frames

i am facing issues when displaying a gxt window in my sample gwt
application.

1. gxt window is not displaying on the whole viewport. I see scroll
bars at the bottom and side. i would like the window placed above when
maximised.
2. i have tow frames in my html page. when i try to display the
window, it is displaying in only one frame. I would like to display on
top of both the frames.

can anyone please give me any suggestions to solve this issue.

thanks...

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