title: Adobe AIR canvas dimensions messed up
body: <p>I'm messing about with Canvas in Adobe Air. But their seems to be some issue with the mouse coordinates. The more I click towards the right, the difference between the draw position and actual click increases.
  My code is </p>
  
  <pre><code>Wb.canvas.fillRect(evt.clientX-canvasTag.clientX, evt.clientY-canvasTag.clientY, 50, 50);
  </code></pre>