I just installed a trial version of Silverlight controls. I'm unable to use any of the Silverlight controls from Infragistics.
First I couldn't see NetAdvantage controls in the Toolbox, but then when I right-clicked the toolbox and clicked "Show All", I was able to see the controls but they were in disabled state .
I use VS 2010, with Silverlight 3.0
Which version of the product did you install ? NetAdvantage 2010 v 3? If so that is built against Silverlight 4.