This is an annoying behavior and I'm wondering if there is any way to keep it from happening. I'm using SW2014 SP5. I have a large-ish assembly and start editing a part directly in the assembly. Say, for example, I create an extrude. After the feature has been made, the feature tree will collapse as if I hit the "-" next to the part. I have to keep expanding it. It's annoying to have to find the part in the tree and re-expand it so often. Do other people have this problem? Is there any work around?