title: How to update/refresh overlays in GMap?
body: <p>I have this problem:</p>
  
  <p>I have a list of points <code>List&lt;PointLatLng&gt;</code> and an overlay where a trajectory of the points is shown. I also use <code>TabPages</code> and inside one page there is the <code>gMapcontrol</code>. Unfortunately the trajectory is updated only when the page is not shown, I mean, when the focus is on another page.</p>
  
  <p>Once I open the page with the Map the trajectory stops to update. How can I fix this?</p>
  
  <p>I tried with:</p>
  
  <pre><code>BeginInvoke((Action)(() =&gt; gMapControl.Refresh()));
  </code></pre>
  
  <p>Inside the <code>DataReceived</code> event, but it only works as I said before.</p>