protected override void FinishDrawing()
{
var rect = GetNormalRectangle(_Points[0].LayerCoordinates, _Points[1].LayerCoordinates);
var go = new RegularPolygon(_grac.Doc.GetPropertyContext());
go.SetParentSize(_grac.ActiveLayer.Size, false);
go.SetRelativeSizePositionFromAbsoluteValues(rect.Size, rect.LeftTop);
// deselect the text tool
_grac.SetGraphToolFromInternal(GraphToolType.ObjectPointer);
_grac.ActiveLayer.GraphObjects.Add(go);
}