tabpanel with mouse-over popup

[usml]

Hi,
I just started learning GXT. I've used GWT before. My question is: can I create a webpage with tabpanel (or something similar) and have mouse-over on each tab to show me secondary level page selections? This is commonly used on web pages these days, here're a couple quick examples:
http://www.dell.com/content/topics/segtopic.aspx/xps-laptops?c=us&cs=19&l=en
http://www.bestbuy.com/

I don't see a way to do it in GWT. I wonder if that can be done easily (or at all) in GXT.

TIA.

[sven]

What you see there you can more compare the the MenuBar: http://www.sencha.com/examples/#menubar

However you also will need to customize that so it automatically drops down on mouse over.