i guess i found a bug, if DrawDottedPolyline is used, every curve drawn after is drawn dotted. This happens in V5 and the WIP. btw. if i would get a free wish for this, please add a closed option to the regular DrawPolyline method
Thanks @stevebaer, i ended up adding the first point to the polyline pointlist since i needed he thickness bumped up from the default which is not available in DrawPolygon.