Ahmed,
To answer the question straight up, yes I do. Just go into SSMS (SQL Server Management Studio) and right click on the table. Select "show dependencies" and you'll see how this is done. You'll find what stored procedures do the insert.
The way DNN is set up, there will be a stored procedure call from somewhere in the VB code after a module is created -- that is once the extension process completes. Just look for the stored procedure name. It will be in some sort of SQL Provider Project method. If you're using 6.x or later the code will be in C# or at least C# is a choice.
If you have the full source code, you can find it. Exactly where does it live? I'm not sure. But how to find it, the above is what I'd do to find it.
This being said -- DNN is solid. It won't leave out things like the name of a module in the drop down list.
What module is this that isn't loading? Look in its manifest file and I'll bet a C Note against a termite-ridden fence post the entry for the drop down list is missing from the manifest.
This sort of thing missing is a BASIC.
I'd get with the provider of the module. Something isn't right when the manifest is parsed and the module is loaded.
Is the problem you're trying to solve is that you can't find the module in the drop down list once you've processed it through the Extensions wizard?