VisualizationsForVaadin fetching data from google

I have been using VisualizationsForVaadin for a month or so, and had not noticed until today that I need to be connected to the internet in order for the charts to work. is this correct?

I am using the interactive line, bar and pie charts, which according to the documentation on the google website do not need to send any data to google to work… am I doing something wrong?

Thanks!

From the google documentation
here
it says you have to be connected.
Regards Phil