Add Info window on drawingManager 'overlaycomplete'

addInfoWindowDrawingManager.js

google.maps.event.addListener(drawingManager, 'overlaycomplete', function(event) {
  if (event.type == google.maps.drawing.OverlayType.MARKER) {
    //event.overlay.setTitle("Hello");
    var infowindow = new google.maps.InfoWindow({
      content: '<div id="content" onmouseover="updateContent()">Hello</div>',
      maxWidth: 10
    });
    google.maps.event.addListener(event.overlay,'click',function(){
      infowindow.open(map,event.overlay);
    });
  }
});