Python - Zope Question

[AM]

I have a problem when I try to assign a value to a textbox in a form
from a python procedure:

I have this simple procedure that assign a value to the md5Hash
textbox

def test(hexHash):
self.md5Hash = hexHash
time.sleep(15)

The value is assigned to the textbox (I can see it in the form and is
avaible to other function) only after the procedure has finished
(after the sleep)
Is there a way to force the update of the control so I can see the
value and use it from other procedure immediately after it is assigned
(self.md5Hash = hexHash)

THANKS

Alessandro