We were unable to reproduce this issue in our side with 2013.1.403.45 binaries. Could you provide us with more details:
- what is your Visual Studio version.
- what is your Operation System.
- do you merge only the System.Windwos.xaml and Telerik.Windows.Controls.xaml. If no which of our other controls you use.
Thank you for your cooperation in advance.
the Telerik team