A few days ago i asked a question, about how to see the modification of a build definition in tfs 2012. I found out, there is no way by default in VS to do this and i also got a link from this tool in the vsgallery:
http://visualstudiogallery.msdn.microsoft.com/ec36f618-d122-48a3-8236-7d9cd19791ee
My question is how to restore a build definition using this tool? I don't see any menupoint 'Restore' in the context menu of any build definition.
If you want to restore a definition to a previous state, you'll have to do it through a Source Control checkin first: