Custom InfoWindow on Google Map v3 with Shadow

I have to add a custom styles Info Window to a Google Map. The rounded border has to go and I have to change the close button.

I've found InfoBox fro开发者_C百科m Google Maps Utility Library which works fine but it doesn't seem to support shadows. Does anybody know of how to achieve this?

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Implement the Maps API v3 OverlayView class and use getPanes().floatShadow to get a container into which you can insert a shadow image, and getPanes().floatPane to get a container into which can insert your main infowindow container and content.