If you want to use RadScheduler control you have to use RadConstrols for Sivlerlight 4(Q3 2011 version) instead of RadControls for Silverlight 5. Q1 2012 version of the controls does not include RadScheduler control anymore.However, RadControls for Silverlight 4 should works as expected in Silverlight5 application.
RadScheduleView is a completely new control with more features and better performance than RadScheduler.
I encourage you to migrate from RadScheduler to RadScheduleView.
You can review the following help article
with details how to upgrade and contact us with any problems that you may met during the migration.
All the best,
the Telerik team
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