def action_bar(show_action_bar, opts={})
        @action_bar_options = ({show:true, back: true, icon: false}).merge(opts).merge({show: show_action_bar})
      end
def action_bar(show_action_bar, opts={})
        @action_bar_options = ({show:true, back: true, icon: false}).merge(opts).merge({show: show_action_bar})
      end
Sets up the action bar for this screen.

 Example:
   action_bar true, back: true, icon: true,
     custom_icon: "resourcename", custom_back: "custombackicon"