[Seaside] Render into a separate document while sharing context

[Norbert Hartl]

I'm doing a page at the moment that contains a google map. On the html page there is a list with all entries and on the map there are the markers on the geo position. 

To place a marker I need to call some javascript function. That function takes latitude, longitude and a definition of a window that pops up if the marker is pressed. The popup window needs to contain an html anchor. Therefor I need to add the callbacks to the current renderer.

Is there something that assists in doing this. WABuilder would be fine but it creates a new render context. 

thanks,

Norbert