PATCH: Not redrawing window in About dialog

Created an attachment (id=5994)
not redrawing about window

In shell32.dll there is a function ShellAbout
to show About window. In this window there is
a button Authors that shows/hides authors window.
After pushing this button About window isn't redrawn.
You can see this situation in attachment image.

Way of reproduce:
1) Open any standard GUI application that calls ShellAbout.
(Explorer, Calc, Winelib, TaskManager, others).
2) Help->About
3) Authors button

I've attached patch that corrects it.