Add RadRichTextBox to VS Toolbox?

[Jason]

I can't see how to do this. I have added a Telerik tab to my Toolbox, done CHOOSE ITEMS and added Telerik.Windows.Controls.Navigation.dll as per here:

http://www.telerik.com/help/silverlight/installation-adding-to-vs-2010-toolbox.html

I now have a load of Telerik controls in my Toolbox, but not RadRichTextBox. What am I doing wrong?

Thanks,

Jason.
Using Visual Web Devceloper 2010.

[Jason]

Never mind. Found it. Had to add Telerik.Windows.Documents.