MS Project 2010 with Visual Studio 2010

Question

I am developing an API for MS Project 2010 with Visual Studio 2010. I need to know how to programmatically assign a Task ID to a Drawing object in the Gantt Chart view. This is set using the Format Drawing dialog box in Project 2010. Instead of doing it from the Project interface, I need to set it through C# code programmatically.

Thanks a lot in advance.