Google Map: multiple InfoWindow event handlers

Thanks! Very helpful solution.
The following example is the solution using tag.

def marker_click(sender, **event_args):
  i =GoogleMap.InfoWindow(content=Label(text=sender.tag))
  i.open(map, sender)

marker = GoogleMap.Marker(position=position)
marker.tag = 'the text you want to show'
marker.add_event_handler("click", marker_click)