Killing root windows

[Hasanen Naufal]

Hi , today i logged in my Mandrake 8.1 system as a normal user ( not
root ) , then opened konsole , entered su and here i am in a root mode.
after that i opened kshowmail ( as a root ) using su , then suddenly
kshowmail crashed so i went to the XKill icon in the desktop and used it
to
kill  the kshowmail window.
but is kiling an X window has a root ID by a program (XKill ) without a
root ID is a normal thing ??? is it a security bug ???
inform me please if i was wrong.

thanx
Hasanen.

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