How to configure KDE so that windows are not visible in all desktops

Hi i recently upgraded to fedora 11 which has kde 4.2 . Now when i tried to configure it such that a windows opened in a particular desktop would not appear in any other desktop, i was unable to find any such option. Whereas i had done this in my fedora 10. Now maybe i don't remember that where is that option.

I know that is a silly problem but plz help me. This thing makes managing multiple tasks simultaneously very easy. Also we can quickly switch to a different desktop if somebody suddenly enters the room and we are doing some secret work!!!

oops i found it.....

it's in the taskbar options.....

just right click the taskbar and you'll have that option