Sorry for the late reply. I was not able to reproduce the issues you describe. On my machine I have all the necessary tools for Silverlight 4 development as described in http://www.silverlight.net/getstarted/silverlight-4/
. Then I installed our 2010 Q1 Silverlight controls (RadControls_for_Silverlight_2010_1_0309_TRIAL).
I am attaching few screen recordings that show how I am adding a RadSlider on the canvas in both VS 2010 and Blend 4.
Additionally, the screenshot bellow shows the version of Silverlight I have on my machine.
Before I ran Blend 4, I had to register our controls in Blend's toolbox. The toolbox-blend4-sl4 attachment contains a .reg file that demonstrates how to do that. Open it with any text editor to see its contents.
Let me know how I can be of further assistance on the topic.
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