Hi,
I installed the gtk-qt-engine. In Kcontrol, an Menu appear GTK Styles and Fonts. I select the option to apply KDE style to GTK application then reboot.
Result : nothing change
. At least for smart and for the progress bar on boot.
Now I install the groupe package named "GNOME Desktop Environment" with yum. In smart, the buttons, tabs and progress bar changed, but not the icon.
Conclusion, even in KDE environment, it use some package in "Gnome group package" for some style .... The best is to find what precisely which packckage but for now, I will let it as it is. I will try to find them later ...
Thanks anyway :-)