Hi,
The Google map control currently contains basic interaction this functionality should be added to this control by adding a server side object module that should be serialized to the control rendering meta-data to be used by the client scripts.
We will provide soon hosted source control via subversion to allow easy participation in such projects for contributing but in the mean time you can use the support at visualwebgui.com mailbox if you have updates that could help the rest of the community.
Thanks,
Guy