I ran Xephyr with following command:
Xephyr :2 -host-cursor -screen 800x480x16 -dpi 96 -ac &

Then i login to scratchbox and i ran the 2 following commands:
[sbox-FREMANTLE_ARMEL: ~] > expoert DISPLAY=:2
[sbox-FREMANTLE_ARMEL: ~] > af-sb-init.sh start
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
Note: For remote X connections DISPLAY should contain hostname!
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
Starting Keyboard
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
/scratchbox/tools/bin/misc_runner: SBOX_CPUTRANSPARENCY_METHOD not set
[sbox-FREMANTLE_ARMEL: ~] >



But i just see a empty window for Xephyr.What's my problem?