code: function createWorkingSetViewForPane($container, paneId) {
          var view = _views[paneId];
          if (!view) {
              view = new WorkingSetView($container, paneId);
              _views[view.paneId] = view;
          }
      }
docs: Creates a new WorkingSetView object for the specified pane
  @param {!jQuery} $container - the WorkingSetView's DOM parent node
  @param {!string} paneId - the id of the pane the view is being created for