[Gambas-user] qt4 not working like gb.gui?

[Wolfgang, dl7nb]

Hello,
now that I have learned the gb.gui does not work for me I have tried qt4.
To my surprise I can not set the backgroundcolor of e.g. Tabstrip (only 
a small area is in background color) or button, which has no background 
at all.
Is this a bug or is this a feature?

Wolfgang

[System]
Gambas=3.5.3
OperatingSystem=Linux
Kernel=3.5.0-51-generic
Architecture=x86
Distribution=Ubuntu 12.04.4 LTS
Desktop=GNOME
Theme=QGtk
Language=de_DE.UTF-8
Memory=2000M
[Libraries]
Cairo=libcairo.so.0.0.0
Cairo=libcairo.so.2.11000.2
Curl=libcurl.so.4.2.0
DBus=libdbus-1.so.3.5.8
GStreamer=libgstreamer-0.10.so.0.30.0
GStreamer=libgstreamer-1.0.so.0.1.0
GTK+=libgtk-x11-2.0.so.0.2400.10
OpenGL=libGL.so.1.2.0
Poppler=libpoppler.so.19.0.0
Qt4=libQtCore.so.4.8.1
SDL=libSDL-1.2.so.0.11.3

Example added...
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