VirtualBox no men bar

[wuzf]

hi: I compile VirtualBox4.2.12 on uBuntu12.10(64bit),the compile step is as follows:
./configure --disable-hardening
source ./env.sh
kmk all

cd out/linux.x86/release/bin/src
make
sudo make install
cd ..
modprobe vboxdrv
./VirtualBox
Then i found VirtualBox without the menu bar, what reason and how i do?
Thanks!

[Perryg]

Ubuntu moves all title bars to their top panel.

[wuzf]

I found the men bar. Thanks!