KDE "space on ok"

[Sergey <mafia_rgd mail ru>]

Here is a stupid issue, however it does not let me sleep well... If you go to 
any options dialog in KDE, or just see a messagebox, why pressing space on 
OK, Cancel, Retry, etc, only pushes it down, and does not act as usual? 
Pressing enter is ok. Browse with <tab> to highlight an OK button and click 
space...