Well, our Silverlight control are installed into the toolbox automatically but sometimes, for some reason, which we will investigate, the toolbox is not updated correctly.
Alternative approach to the one suggested by my colleague is to perform Reset operation on the toolbox.
Hope this helps.
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Public Issue Tracking
system and vote to affect the priority of the items