[Bf-python] Blender.Draw.Scrollbar does not work

[Michael Reimpell]

> Blender.Draw.Scrollbar does not work (at least on linux). This already
> affects the bundled doc_browser script.

To be more specific: The following script does display a grey button and never prints the scrollbar.val, even if I click on that button.

import Blender
scrollbar = Blender.Draw.Create(1)

def event(evt, val):
	if evt == Blender.Draw.ESCKEY:
		Blender.Draw.Exit()
	return

def button(evt):
	if evt==1:
		print scrollbar.val
	return

def gui():
	global scrollbar
	scrollbar = Blender.Draw.Scrollbar(1, 10, 10, 100, 100, scrollbar.val, 0, 10, 1, "does not work") 
	return

Blender.Draw.Register(gui, event, button)