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Show Smart Tag(Shift + Alt + F10) Is Disabled Or Greyed In ASP.NET Web Forms Server Control

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When adding ajax extenders to asp.net server controls using Smart Tag, you often encounter an issue such as Show Smart Tag is greyed out/disabled.

The best thing to do is to use the latest stable version of AjaxToolkit.
And then, reset the toolbox. Sometimes, you have to close the Visual Studio IDE just to make sure.

IDE Version: Visual Studio 2010 Professional
Ajax Toolkit Binary: AjaxControlToolkit.Binary.NET4 (Stable Version)

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