>I want to build a UI just like VS 2005.
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>There will be a menu bar and toolbars. On the bottom, there will be a status bar control.
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>VS has a tabstrip control and dockable sidepanes. When a side pane is docked, a splitter is enabled between the pane and the tab strip, on either side. This is the part I'm unsure of. I could use some insight on how to build this.
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>
>
>Thanks.

Checkout this project:

http://sourceforge.net/projects/dockpanelsuite/