I'm getting a little problem after migrate to Q2 2012 SP1. I have the following code:
When I was using Q3 2010, if I choose an item, leave the control and get focus back to control, I could start typing a new word and the control started to search this new word normally.
After migration process, If I do the same process, control does nothing. I get filter again only after I delete the previous choosed value.
This issue happens in the following demo too: http://demos.telerik.com/silverlight/#ComboBox/Configurator
(just after configure the properties like the code above.