title: Markers of the overlay items stay invisible on MapView
body: <p>I am trying to add an overlay to the map view as it is described <a href="http://developer.android.com/resources/tutorials/views/hello-mapview.html" rel="nofollow">here</a>.
  Everything works as expected (even onTap event is fired) except the fact that markers remain invisible.
  I've modified an <code>onTap</code> method adding the line</p>
  
  <pre><code>dialog.setIcon(item.getMarker(0));
  </code></pre>
  
  <p>Now markers become visible after taping any item (i have two items in the overlay and I use the same drawable as a marker for both).
  When I turn the device (causing the map to redraw) markers become invisible again.</p>
  
  <p>I am using Samsung Galaxy p1000 with Android 2.2.
  Any ideas?</p>