[Development] Why I can't use ibus Input Method for type Chinese character?

[Yuchen Deng]

Hi, there!
I want help because I can't input any Chinese character for Qt5 based
application, include QtCreator when build with Qt5.1.

I just know I need build D-Bus for plugins/platforminputcontexts/ibus.
Then I did, and I can sure QtCreator loaded the ibus plugins.
Here is the full log: http://pastebin.mozilla.org/2393461

But I still can't input Chinese in QtCreator, because ibus tell me there
`No input window`.

I asked in #qt, #qt-labs, and #qt-cn, but seems nobody know why and how.
So I think it's maybe is a bug.
Any comments are welcome.
Help needed. thanks a lot!

-- 
Best Regards
Yuchen
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