title: Handling click events on z-index'd layers
body: <p>I have 2 z-index layers in a map application I'm building. I have a problem when I click on  the layers to zoom in. The click handler is on the underlying z-index layer and I don't want it to fire when a control in the overlying layer is clicked. </p>
  
  <p>The problem i have is that the event gets raised no matter what but the originalTarget property of the event is not the image in the underlying layer when something on the top layer is clicked. Is there anyway to change this?</p>