Parse kml with geoxml3 in maps api v3 but stop rebuilding the sidebar when bounds/zoom changed

I've found a great page that demonstrates ma开发者_如何学Gony uses of the Google Maps Api v2 and v3.

I tried to understand each line of the javascript and make something similar to what can be found on the page linked above.

However I can't understand two things:

In my application I don't want to rebuild the sidebar every time the zoom/bound/mapcenter changes. Currently the sidebar shows only placemarks that are visible on the current mapview. When the user zooms in and a placemark goes out of the view it disappears from the sidebar too. It could be annoying when you already scrolled somewhere and with only a little zooming you loose your scrolled status. Also if you bind events to sidebar elements, changing the view on the map rebuilds the sidebar and your events are finished.

I tried to rewrite the piece of code that creates categories from the placemark's styleurl property to apply to polylines as well not just markers, but I have no luck.

If you are deep in this kind of work please point me to the right direction.

Thanks.