text: // eventually more of editor_tab might land here.  for now, just
  // initialization for loadable panel
  RCloud.UI.notebooks_frame = {
      body: function() {
          return RCloud.UI.panel_loader.load_snippet('notebooks-snippet');
      },
      heading_content: function() {
          var notebook_inner_panel = RCloud.UI.panel_loader.load_snippet('notebooks-panel-heading');
          return notebook_inner_panel;
      },
      heading_content_selector: function() {
          return $('#notebooks-panel-controls');
      }
  };
  