problem with CCTextFiledTTF

I got a problem when using CCTextFieldTTF…

If I attachWithIME > close keyboard> press back key on device, then the activity will be destroy (onDestroy is called)
I think this is because the focus is not on GLView anymore so the activity got the back key

Is there anyone got the same problem? I use cocos2d-1.0.1-x-0.11.0

Test this on my acer liquid and sony xperia arc both have the same problem.

http://www.cocos2d-x.org/boards/10/topics/6479?r=6791#message-6791

thank you Milda… it solves the problem… (Menu key has the same problem so you have to add menu key also.)
But anyone knows why this happen ?