I have similar problem with C#. I have a XYModul.dll with I can call in two different ways. The first way is to call it form another .exe project within the same visual studio solution. The second way is to call it with an inventor add-in with is another projekt within the same solution. The selecting works fine when use the modul with the .exe project, but it doesn't work as add-In. The add-in itself is a DLL with I start with inventor.
There is a C# add-in code sample in the Inventor 2009 edition, called CustomCommand and the selecting works there. Now, I am trying to understand the difference.
Message was edited by: thmsfrst