New Post: MapWinGIS v4.9.2 released

set_LayerVisible is available in the documentation: http://www.mapwindow.org/documentation/mapwingis4.9/group__map__layer__properties.html#ga9f29503b417d5e4c48a94ed8ca50aeeb and should also be in Intellisense.
PointToClient and PointToScreen are .NET control methods and exist in the .NET Framework. Here's a great explanation about these two methods: http://stackoverflow.com/questions/1913682/control-pointtoclient-vs-pointtoscreen

Thanks,

Paul