How to change a Group topic's status

Hopefully this is an easy one...

I can only see one place where the "Topic status" can be modified - at the creation of the topic.  Is there any way that a Topic's status can be changed after the creation of the topic?  I'm thinking here about questions like this one I'm asking here - I would like the status to be Open for now, but once a solution is identified I would like to change the status to Closed.  Is it possible?