How to set anchorPoint of UIPanel to Point(0.5, 0.5)

I test SimpleHelloUI with
CCEGLView::sharedOpenGLView()->setDesignResolutionSize(designSize.width, designSize.height, kResolutionFixedHeight);

But the scale of UIPanel based on Point(0, 0), how to set anchorPoint to (0.5f, 0.5f)? I want the scale that caused by kResolutionFixedHeight based on the center of scene.

BTW, the help for UIPanel ([[http://upyun.cocimg.com/CocoStudio/helpdoc/v1.0.0.0/zh/3-3-9UIEditor-Widget-UIpanel.html]]) not exist.