Toggle Visibility of a Sidebar Element

Hey,

I try to toggle the visibility of a Element. But I dont get a resizing done :(

I use a DockLayoutPanel:
In the WEST I got a "Sidebar". In the CENTER I got a Frame...

I made the Sidebar invisible via: DOM.setStyleAttribute(SideBar.getElement(), "display", "none");

But the CENTER dont take the free space. (DOM.setStyleAttribute(CenterFrame.getElement(), "position", "relativ"); didnt worked)



Via Firebug i found out, that the center is wrapped in a div-tag that I cannot manipulate.

So anyone know whats the propper way, to make the Sidebar visible/invisible ?

Help is much appreciated.

Thanks in advanced.

Regards

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