code: def RootNode(self):
          
          tree = self.loader.get_root( self.viewType )
          adapter = self.loader.get_adapter( self.viewType )
          rows = self.loader.get_rows( self.viewType )
          
          adapter.SetPercentage(self.percentageView, adapter.value( tree ))
          
          return adapter, tree, rows
docs: Return our current root node and appropriate adapter for it