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Tool box controls missing


When i try to add officewebui.dll to my toolbox, it does not display all the controls all the items in the toll box list.
I am using VS2010 ultimate, I have also tried it on VS2008.
See attached limited list of tool box items. However, I open the downloaded source code, it shows complete list of controls.
This is also causing me error while creating OfficeWebUI:BackstagePage and RibbonContext etc.

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