Thanks for contacting us and for your question. Could you please share some more information about the version of RadControls for WinForms you are using and the way you installed the suite?
In fact, there are some issues with the Toolbox integration of our controls in Visual Basic Express Edition which we are aware of. However, there is a quick and easy way to manually add our controls to the ToolBox which you can use to overcome that problem. Take a look at the following KB article:
Manually Adding RadControls for WinForms to the Visual Studio Toolbox
I hope this will be helpful. However, you can write anytime you need further assistance.
the Telerik team