Today, I tried to add the AjaxControlToolkit Controls to my Toolbox in Visual Studio 2008. But when I selected “Choose Items…” in the Toolbox, Visual Studio just crashed without any Errors.

That could happen because of some defect or deinstalled Toolbox Items.

Here’s how to fix that:

1. Search the Binary devenv.exe
2. Start it with the command line Parameter /safemode
3. Use Choosse Items... in the Toolbox
4. Click thru all the Tabs
5. Close Visual Studio
6. Open Visual Studio normally and it should work again