public virtual void OnMinAngleReached(RotateTransformGrabAttachEventArgs e)
 {
     if (MinAngleReached != null)
     {
         MinAngleReached(this, e);
     }
 }
 public virtual void OnMaxAngleExited(RotateTransformGrabAttachEventArgs e)
 {
     if (MaxAngleExited != null)
     {
         MaxAngleExited(this, e);
     }
 }
 public virtual void OnAngleChanged(RotateTransformGrabAttachEventArgs e)
 {
     if (AngleChanged != null)
     {
         AngleChanged(this, e);
     }
 }