How to get markers from a GGeoXml loaded overlay in Google Maps?

Question

I load a feed of markers from a GeoRSS source with the GGeoXml function. The markers come with a infowindow upon click. I need to remove this infowindow (since it does not fit inside my map), and bind a new click event on the markers. But how can I access these markers? I only have a reference to the GeoRSS overlay.