I was not able to reproduce this issue at my end. This is the configuration I have:
Microsoft Expression Blend 4.0.20525.0
RadControls for Silverlight 2010.2.0714.40
To make the controls appear in the Assets tab of Blend, I executed the following .reg file:
(note: you can substitute the path to the binaries with your own)
Windows Registry Editor Version 5.00
Please find attached a video showing me trying to reproduce the issue as well as the .reg file. Let me know if I am missing something.
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