Using Event::Refresh

[vaibspider]

Hi,
I wanted to have the screen contents refreshed after each timer interrupt. I found and tried Event::Refresh inside on_event() function. But somehow, it seems even if I've set autorefresh or fps, only the draw() function is affected. It doesn't seem to reach Event::Refresh at all.
Could you please confirm if using Event::Refresh inside on_event() for Canvas is appropriate for such a situation or something else should be used?
Thanks!