xdotool doesn't work with QT, but work with GTK?

[andrey.ale...@googlemail.com]

Hello,
 I just tried xdotool and noticed that

 $ xdotool key --window $(xdotool search --name aurora) ctrl+t

 works fine (it opens new tab in aurora/firefox)
 But if I tried to do (close the Dolphin window)

 $ xdotool key --window $(xdotool search --name dolphin) alt+F4

 nothing is happened.
 Whats wrong? Is that mean that xdotool doesn't work with QT?
 
 Gentoo Linux, KDE 4.11.2