method
DrawRoundedRectangle
System.Windows.Media.DrawingContext.DrawRoundedRectangle(System.Windows.Media.Brush, System.Windows.Media.Pen, System.Windows.Rect, System.Windows.Media.Animation.AnimationClock, System.Double, System.Windows.Media.Animation.AnimationClock, System.Double, System.Windows.Media.Animation.AnimationClock)