We are aware of the described issue and has already been logged in our public issue tracking system, you can track its status on the following link (it is described a little bit different, but it refers to the same issue):
There is also a work-around in the description you can try it, but unfortunately it is mainly for Silverlight. However the work-around should improve the current behavior of the Window for now.
Thanks for understanding.
TRY TELERIK'S NEWEST PRODUCT - EQATEC APPLICATION ANALYTICS for WPF.
Learn what features your users use (or don't use) in your application. Know your audience. Target it better. Develop wisely.
Sign up for Free application insights >>