code: def OnUpView(self, event):
          
          node = self.activated_node
          parents = []
          selected_parent = None
          
          if node:
              if hasattr( self.adapter, 'best_parent' ):
                  selected_parent = self.adapter.best_parent( node )
              else:
                  parents = self.adapter.parents( node )
              if parents:
                  if not selected_parent:
                      parents.sort(key = lambda a: self.adapter.value(node, a))
                      selected_parent = parents[-1]
                  class event:
                      node = selected_parent
                  self.OnNodeActivated(event)
              else:
                  self.SetStatusText(_('No parents for the currently selected node: %(node_name)s')
                                     % dict(node_name=self.adapter.label(node)))
          else:
              self.SetStatusText(_('No currently selected node'))
docs: Request to move up the hierarchy to highest-weight parent