I have an app that uses V2 of the API (http://www.treksee.com). I'd like to 
upgrade to V3.

In the center of the map I display a crosshair. This is implemented with the 
GScreenOverlay object. The crosshair is fixed in the center of the viewport 
and allows mouse events through to the underlying map. For example, a click 
on the crosshair will register with the underlying map's event handler and 
display a marker.

How can I implement this functionality in V3 which lacks the GScreenOverlay 
object?

Thanks.

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