plot inside Google Earth Balloon with Matlab

I'm trying to plot a timeseries inside the Google Earth placemark balloon. Do you know how to do that with Matlab?

ref = importdata(rfn,rfd,rhl);         % import data from loaded file

iconStr = 'http://maps.google.com/mapfiles/kml/pal2/icon18.png';
kmlstr = ge_point(ref.data(2,5),ref.data(2,4),ref.data(2,6),'iconURL',iconStr);
ge_output('example.kml',kmlstr);

That's what I've done

and that's an example of what i should do.

I'm using Google Earth toolbox and i tried with ge_screenoverlay function and with ge_plot nested inside ge_point but didn't work.

Thanks you!