Quick note. I'm not sure if this is true in Visual Studio 2008, but if you had this control in a project that you edited with Visual Studio 2005, you would have completely broken intellisense with this control. When Visual Studio tries to create XML schema files for intellisense pop-ups in markup files, it completely breaks when it sees common controls like this and leaves the schema file completely, leaving you without intellisense for any controls in this assembly.
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