Taskbar shows all application from all 4 virtual desktop

I am a newbie to SUSE. I install suse 11.4 (KDE) in my lap top. The problem is that the taskbar shows all the application from all 4 desktop. I want to restrict to taskbar to show the application of its own desktop only, not that of other desktops.

Right click in the area where your taskbar is
and configure to show only apps on current desktop