code: def dispatch(self, receiver):
          ''' Dispatch handling of this event to a receiver.
  
          This method will invoke ``receiver._columns_patched`` if it exists.
  
          '''
          super(ColumnsPatchedEvent, self).dispatch(receiver)
          if hasattr(receiver, '_columns_patched'):
              receiver._columns_patched(selff dispatch(self, receiver):
          ''' Dispatch handling of this event to a receiver.
  
          This method will invoke ``receiver._columns_patched`` if it exists.
  
          '''
          super(ColumnsPatchedEvent, self).dispatch(receiver)
          if hasattr(receiver, '_columns_patched'):
              receiver._columns_patched(self)
docs: Dispatch handling of this event to a receiver.
  
          This method will invoke ``receiver._columns_patched`` if it exists.