Drawing 2D regions on a Map

Question

This should be much easier than what I am experiencing. I think I'm being dumb. Anyway I need to draw complex 2D regions (with holes and may consist of a few areas not physically connected) on a world map in C# winforms, then also get an event triggered when one is clicked(also need to know which one)
I have been using GMapPolygon up until now but this proved to be insufficient because it just builds with lines. I am also aware of the Ggoogle Maps Javascript API, but this does not seem to be free.

Are there any good free libraries that can help me here?