Screen locker background

[paul]

In KXStudio the background for the screen locker is "KXStudio Stripes" instead of the KDE default (which is Elarun).
How do I change it to my custom background? Which file should I change?

(I know there is the "widget screen locker option", but that is unsafe, as it lets someone else see my files - anyone can change the background of the locked screen!)

Thanks.

[paul]

Found it! In case anyone needs:

/usr/share/kde4/apps/ksmserver/screenlocker/org.kde.passworddialog/contents/ui/main.qml