message: Fix member info not opening
  The subclasses listen for view_user and similar dispatches, which then start up the RightPanel. We weren't registering a listener though because we changed to using the RightPanelStore for most of our logic.
diff: @@ -42,10 +42,16 @@ export default class HeaderButtons extends React.Component {
  componentWillMount() {
  this._storeToken = RightPanelStore.getSharedInstance().addListener(this.onRightPanelUpdate.bind(this));
  + this._dispatcherRef = dis.register(this.onAction.bind(this)); // used by subclasses
  }
  componentWillUnmount() {
  if (this._storeToken) this._storeToken.remove();
  + if (this._dispatcherRef) dis.unregister(this._dispatcherRef);
  + }
  +
  + onAction(payload) {
  + // Ignore - intended to be overridden by subclasses
  }
  setPhase(phase, extras) {
  