after installing applications, they don't appear in kickoff

I run openSUSE 13.1 KDE. I came to openSUSE from Kubuntu. I remember that this issue had also occurred in Kubuntu, although not as often.

When I install an application from the repositories that has a GUI frontend, it often does not appear as an item in the kickoff menu. I can still open it by searching for it in alt+F2 or by command line, though.

I would prefer that every application I have that has a GUI frontend be listed in the kickoff menu. Is there a reason that this is not the case? How can I rectify this?

Thank you!