This is not an issue here!
If you want to combine charts and widgets in the same HTML page, you have to load two different JSs with the same name: FusionCharts.js.
First one is for charts and the second one is for widgets, boat using the same name of the script and the same name for the functions in it,
but different signature and processing. So, you can't combine charts and widget together. I'll be glad if I'm wrong here.