This topic briefly discusses an issue unique to COM container applications. Debugging a container application is very similar to debugging a standard MFC program, except when you attempt to debug an event that generates a callback (such as dragging data over the container application). In this case, you must set a breakpoint in the callback function.
Note The Visual C++ debugger supports stepping across and into containers and servers. This includes the ability to step across Remote Procedure Calls (RPC). For more information, see Debugging ActiveX Applications.
See Also Debugging COM Servers