Re #179 Wire sidebar button.

to be discussed:
- right now, I have the button always open "hotdish" unless it's not.
- groupManager is gross
- should the button 'toggle' and existing hotish?

Nits / wontfix:
- styling is RAD in UXBranch, but meh in aurora
Merge pull request #179 from gregglind/b179-wire-button

Wire toolbarbutton