I'm using your richtextbox component and I have trouble when I switch to fullscreen with the code below :
App.Current.Host.Content.FullScreenOptions = System.Windows.Interop.FullScreenOptions.StaysFullScreenWhenUnfocused;
App.Current.Host.Content.IsFullScreen = !App.Current.Host.Content.IsFullScreen;
When the silverlight is in fullscreen, the richtextbox is in readonly state.
I can see the prompt blinking, but whatever I type, nothing happens.
I'm totally stuck for now, any help would be appreciated.