How to keep aspect ratio when change to fullscreen

[xushunwang]

I create a new scene and click NGUI->Create->UITexture to add a texture.
Change UIRoot's scaling style to FixedSize and Manual Height to 384
The texture is 512*384 , the ratio is 4:3.


When i build and run it in window mode , it looks well.
But if I run it in fullscreen , I find the texture is stretch to fill the screen . the aspect ratio is not 4:3 any more, it change to 16:9!

I want it stretch based on height and keep aspect ratio like this picture :

[ArenMook]

All widgets have an "aspect ratio" setting that you can set. Anchor only top and bottom sides, leaving left and right free. Choose the aspect ratio based on height.