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shtirlitsDva/WT-Tools_for_AutoCAD
In this plugin I used the ObjectARX API (C++) to create several custom objects and then I mixed the C++ project with a .Net C# project using an unmanaged .net wrapper. With this approach I can fire my C++ custom objects from my .net C# project. I also used the COM API to expose the properties of my custom objects in the AutoCAD Property Palette.
C++