Auto update resources like CSS in hosted mode

[ATom]

I'm use maven from Netbeans IDE. When I run app in hosted mode, all
changes in source are immediately displayed in browser (after
refresh). Bad when I change CSS (directly from IDE), it was also moved
to war folder, but not changed after refresh. Why?

I know, that I can run Jetty manually with scanIntervalSeconds
parametrs, but it's too complicated. Exist any way how to force jetty
in hosted mode automatically refresh it?

I also tried click to "Restart Browser" in GWT windows, but nothing
happen, still use old CSS. When I completely turn off GWT hosted
window and run it again, CSS is updated.

Where is problem?

Thanks you for reply