I din`t mean themes, i meant widget style... Like height, width of control objects (buttons, list boxes, etc)
About kstyle.h, i found this link on this site:
http://api.kde.org/4.0-api/kdelibs-apido…_8h-source.html
(Link describes 4th version, but i`m using version 3.5.8 )
I wanted to change values of LayoutProp of some structures.