how to stop the Left key from moving away the focus

[huzheng <forlinux 263 net>]

at first,thanks Ian Bell's reply,now i can make the drawing_area get the
key_press_event,but ,i want to handle the GDK_Left key,
so,when event->keyval==GDK_Left,i return TRUE in the key_press_event's
callback function. but,the Left key also move the focus out...how can i
stop this?
thank you! :)