public SlideItemProperties CreateShapeSlideItemProperties(
	string id = null,
	SlideShapes shapeType = SlideShapes.Circle,
	string color = "#000000"
)

Public Function CreateShapeSlideItemProperties ( 
	Optional id As String = Nothing,
	Optional shapeType As SlideShapes = SlideShapes.Circle,
	Optional color As String = "#000000"
) As SlideItemProperties