Thank you for the feedback.
Could you set RadGridView.GroupRenderMode="Flat"? If the problem still appears please open a support ticket and send us sample runnable project so we can debug it on our side.
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 >>