I want to create custom symbol and imitate the ESRI sample :"LogoMarkerSymbol". I create a ATL project and realize the interfaces, such as ISymbol, ILineSymbol, etc. But when I compile it ,it cannot show on the ESRI symbol Page. I found that, when the "LogoMarkerSymbol" have been compiled, it will pop a dialog:"ESRI registration utility: registration succeed". I guess it's the problem that my own dll can't show on arcmap. How to call ESRI registration utility? my languge is c++.