VS C# Add-in: Modifying Solution Explorer Tree

Hi everyone, I'm currently working on a project to integrate Subversion source control system into VS .NET. So far it's been going fairly well, but today I ran into an issue that I just can't find a solution to.

For anyone who used Source Safe (*shivers*) with VS .NET, you know that the solution explorer's icons are modified based on the status of a particular file (up to date, changed, conflict, etc).

Does anyone have any clue as to how I might be able to gain access to that file tree and be able to modify icons? The closest that I've gotten so far was getting a handle for that window (Solution Explorer that is), but I can't figure out how to actually find the particular control that I need.

If anyone has a clue, I would greatly appreciate it.