http://developers.de/blogs/damir_dobric/archive/2010/09/01/silverlight-animation-rendering.aspxSome developers know and some do not know that Silverlight has by default one Main thread. Depending on you application many other threads can be span. But there is always only one main thread which is responsible to render the UI objects on the pageenCommunityServer 2008 SP1 (Build: 30619.63)