{{#if target}}
  <div class="btn-group">
    <button class="btn btn-default btn-icon back" {{action "back"}}>{{fa-icon "chevron-left" class="icon-glyph"}}</button>
    {{#if target.paned}}
      <button {{bind-attr class=":btn :btn-default :btn-icon :pin target.panePinned:active"}} {{action "togglePinned"}}>{{fa-icon "thumb-tack" class="icon-glyph"}}</button>
    {{/if}}
  </div>
{{else}}
  <button class="btn btn-default btn-icon drawer-toggle" {{action "toggleDrawer"}}>{{fa-icon "reorder" class="icon-glyph"}}</button>
{{/if}}