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GMapOverlay routes = new GMapOverlay("routes");
GMapOverlay polygons = new GMapOverlay("polygons");
GMapOverlay markers = new GMapOverlay("markers");
gMapControl1.Overlays.Add(markers);
gMapControl1.Overlays.Add(routes);
gMapControl1.Overlays.Add(polygons);
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原文地址:http://my.oschina.net/jingshishengxu/blog/492986