Cfwindow on hide event

I have a dropdown on a page that contains values for cities based on a previous dropdown for state.  I am doing this with a cfselect bind and a cfc.  Works great.  However, I offer users the ability to add a new city with a cfwindow.  Once they add in the cfwindow, I want to refresh the city dropdown on close.  I can't refresh the page otherwise I'll lose other values.

Can I do this without making them change to state dropdown to a different state, then back to the original state?