Closed Issue: Will not install on Visual Studio 2010 [26897]

I have no idea why this is but I follow the instructions adding the tab, choosing items, finding the .DLL file something happens when I click on the OK button but the ajax toolkit tab disappears but when I try to add it again it says that it is already there but I cannot see the tab at all. Any idea why this is happening?

Windows 7 64-Bit
Visual Studio 2010
The latest version of ajax toolkit

P.S. I have tried both 3.5 and 4.0 and the exact same thing happens.

Thanks for any an all help.
Comments: Thank you for sharing your experience!