title: Google maps api v3 DrawingManager no work
body: <p>I'm trying to use the Google Maps APIs v3 but I have always an error</p>
  
  <p>I added the script in the page:</p>
  
  <pre><code>&lt;script type="text/javascript" src="http://maps.googleapis.com/maps/api/js?sensor=false&amp;libraries=drawing"&gt;&lt;/script&gt;
  </code></pre>
  
  <p>and  I've implemented:</p>
  
  <pre><code>var drawingManager = new google.maps.drawing.DrawingManager({
        drawingMode: google.maps.drawing.OverlayType.MARKER,
        drawingControl: true,
        drawingControlOptions: {
          position: google.maps.ControlPosition.TOP_CENTER,
          drawingModes: [google.maps.drawing.OverlayType.MARKER, google.maps.drawing.OverlayType.CIRCLE]
        },
        /*markerOptions: {
          icon: new google.maps.MarkerImage('http://www.example.com/icon.png')
        },*/
        circleOptions: {
          fillColor: '#ffff00',
          fillOpacity: 1,
          strokeWeight: 5,
          clickable: false,
          zIndex: 1,
          editable: true
        }
  </code></pre>
  
  <p>I got the same error always: </p>
  
  <blockquote>
    <p>Uncaught TypeError: Cannot read property 'DrawingManager' of undefined</p>
  </blockquote>