curses newwin

[Michele Simionato]

I have just performed this experiment with curses:

from curses import *

maxwidth=79
maxheight=21

def wait4q(stdscr):
    scr=stdscr
    scr.addstr("Press 'q' to exit\n")
    x,y,=0,0
    while True:
        c=scr.getch() 
        if c==KEY_LEFT and x > 0:
            x-=1; scr.move(y,x)
        elif c==KEY_RIGHT and x < maxwidth:
            x+=1; scr.move(y,x)
        elif c==KEY_UP and y > 0:
            y-=1; scr.move(y,x)
        elif c==KEY_DOWN and y < maxheight:
            y+=1; scr.move(y,x)
        elif c==ord('q'):
            break

if __name__=='__main__':
    wrapper(wait4q)

It works fine and one can move the cursor on the screen. The question
is: why that does not work for a generic window different from stdscr?
i.e. if I replace the line  ``scr=stdscr`` with
``scr=newwin(0,0)``I don't see the cursor moving anymore. 
The 'q' is still recognized, however. I tried with some
refresh(), but didn't work. What I am missing?

TIA,

       Michele