Sometimes Visual Studio.NET 2008 and 2010 Toolbox does not get updated when you install new controls. It might happen with DevComponents controls but with any other controls as well. If the installer for the control registers the controls in Visual Studio toolbox here is something you can try so they show up. What you need to do is delete temp/cached files for VS.NET 2008 or 2010 toolbox so toolbox gets refreshed.

Here is what to do:

  1. Exit all instances Visual Studio
  2. Navigate to your user profile directory for Visual Studio 2008 (this is found at %USERPROFILE%\AppData\Local\Microsoft\VisualStudio\9.0) for Visual Studio 2010 (this is found at %USERPROFILE%\AppData\Local\Microsoft\VisualStudio\10.0). Note that you can paste that into the Explorer at least on Vista and it will navigate to proper folder.
  3. Delete all files with TBD extension found there (they are often hidden files)
  4. Re-start Visual Studio and open your application – the toolbox should be automatically rebuilt (which can take a while depending on your machine’s performance). You should now be able to see newly added control and drag/drop controls onto the design surface.