Need to draw an image in an overlay

[LucasDeVil]

Hi,

I encountered a problem in the MacMapKit MKOverlayView.
According to the Apple Documentation one can override
-(void)drawMapRect:(MKMapRect)mapRect zoomScale:(MKZoomScale)zoomScale inContext:(CGContextRef)context
and draw an image or something like that on the overlay.

I'd love to implement this feature in my own app, but I'm unable to since this method seems not to be called at all.

Apple Example Application:
http://developer.apple.com/library/ios/#samplecode/HazardMap/Listings/Classes_HazardMapView_m.html#//apple_ref/doc/uid/DTS40010049-Classes_HazardMapView_m-DontLinkElementID_8