Callback on mdMenu close

Question

Lets say I have an app that can open menus, for example via $mdOpenMenu($event).

My app needs to set a callback to get notified when a menu opens or closes.

How can I achieve it? I read the official documentation and I can't seem to find it.

I was looking for something like md-on-remove (used on mdChips), but it doesn't seem to be implemented for mdMenu (issue).