So If you are not able to reproduce the behavior in my application, can you please send me a project where it is reproducible ( or at least happens sometimes)? I saw your picture and it got me some ideas about what could be wrong. I have seen similar problem when you try to open a drop down and inside you have a lot of data to be loaded. If this is the case, using a Dispatcher should work.
Hope this is helpful.
the Telerik team
Sharpen your .NET Ninja skills
! Attend Q1 webinar week and get a chance to win a license! Book your seat now >>