The BaseCamera type exposes the following members.
Notify that the current camera has changed
IsRotatingChanged event is fired when the IsRotating is changed.
Notify that camera has become valid (for example after the size of the TargetViewport3D is set) or invalid. To get the new state of the camera, call the IsValid(Boolean) method.
Notify that the current camera is about to change - user can set Handled property to true to prevent the change.