I have the latest build of WPF Q2 SP1 and I am getting the following error:
A TwoWay or OneWayToSource binding cannot work on the read-only property 'xxx' of type 'TelerikTestProject.TestClass'. This error happens whenever I place the GridView inside of a Actipro PopupButton and then inside of a Actipro ResizableContentControl. If I take the RadGrid out of the control I don't get the error. I have a sample project I can send you to reproduce the error.