title: How I can to know if Google Maps starts loading tiles?
body: <p>I need to show a "waiting sign" every single time when GMaps is loading tiles and as soon loading is done, i must hide the waiting sign.</p>
  
  <p><strong>Easy way:</strong> listen <strong><em>tilesloaded</em></strong> event (of course) but...   not always the event fires... and then <strong>I don't know WHEN</strong> take the waiting sign away ? </p>