Right now I've a very extrange problem whenever I Create a Telerik WPF project and wanna use RadGridView a message appears saying that a reference has been added and I've to recreate a control and blablabla , in the reference Windows I don't see that reference added so I've added it by myself and trying to add again RadGridView another error message pops ups saying this time that a method is missing , honestly I don't know what to do I already unistalled and reinstalled Telerik but still I have this errors