Map markers in MapView - scale them in the zoom animation

When the user zooms my MapView, I want the my markers (OverlayItems) to zoom too (during the animation!). After the animation they would return to normal size. This is how markers behave in Google开发者_C百科 Maps. In MapView, OverlayItems in ItemizedOverlay have always the same size even during the zoom animaion, which looks odd.

how about manually rescaling the marker on zoom in/out event?