We have a RadTransitionControl. We dynamically change its content to be a RadBook control and apply a Transition to it. As a result, the SL plug-in crashes and there is an OutOfMemory exception. This issue is applicable to SL ONLY! The XAML team has recently reviewed this issue and will not be addressing it as at this time the team is focusing on the bugs impacting the highest number of developers. If you have encountered this issue and it is blocking for your work please contact us through the support ticketing system with details on your setup and a reference to this item.