[plt-scheme] fullscreen & symbol return

Hi everybody,

I'm still stuck with my little extension:
First of all, is it possible to have a fullscreen canvas% ? I have found nothing about it in the docs but I may have missed something. If yes then is it poossible to combine the gl style with it ?

My second question is about returning symbols instead of values.
I'm using scheme_make_symbol("foo") but at top level:
(bar)
foo
(symbol? (bar))
#t
(equal? (bar) 'foo)
#f

Where am I wrong this time ?

Thanx a lot and have a nice day.