How to block popup info window, when click to polyline?

I place the GGeoXML to map and need to handle clicking on it.
The data for GGEoXML loads from kml.

Code:
GEvent.addListener(map, "click", function(overlay,latlng) {
if (overlay) {
buildInfo(overlay.name);
}
} );

but function buildInfo don't get overlay.name, and shows embedded
infoWIndow with content of tag <name> of polyline

How I can to disable this info window? hide() not works
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