winecfg: Add dll override on return key press in combobox [resend]

[Andre Wisplinghoff]

Thanks a lot for your hints, Reece and Dmitry. I didn't realize the
difference between WndProcs and DlgProcs.
I send a new try and hope everything is okay now :)

http://www.winehq.org/pipermail/wine-patches/2008-December/066762.html

--
Andre