private void ModifyEndAngleWithMouse(IPropertyEntry sender, bool StartModifying)
        {
            GeneralAngleAction gaa = new GeneralAngleAction(endAngleProperty, ellipse.Center);

            gaa.CalculateAngleEvent += new CADability.Actions.GeneralAngleAction.CalculateAngleDelegate(OnCalculateEllipseParameter);
            Frame.SetAction(gaa);
        }
        private void ModifyEndAngleWithMouse(IPropertyEntry sender, bool StartModifying)
        {
            GeneralAngleAction gaa = new GeneralAngleAction(endAngleProperty, circle.Plane);

            Frame.SetAction(gaa);
        }