Qt5.2 Raspberry, how to switch framebuffer ?

[plazma]

Hi,
I have installed 320x240 TFT screen on my RPI. The screen configured as /dev/fb1.
By running
FRAMEBUFFER=/dev/fb0 startx
or
FRAMEBUFFER=/dev/fb1 startx
I can get X-Window on HDMI screen or 320x240 TFT screen.
Qt5.2 application is running on HDMI screen only.
I tried with no success -
./myapp -display Linuxfb:/dev/fb1:enable=1
./myapp -display directfb:/dev/fb1:2

How to switch Qt5.2 application to /dev/fb1 ?
Please help.

[agocs]

./myapp -platform linuxfb:fb=/dev/fb1

[plazma]

thank you. It works.