How to change the display level of two UIWindow with same windowLevel ？
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I am testing UIWindow, and i know windows display level depends on the property "windowLevel".
<br/>But when I test two UIWindow with same windowLevel, and i find the window i “makeKeyAndVisible” is always display in front of other window.
<br/>I don't konw how can i make the window "makeKeyAndVisible" later display in front of the window "makeKeyAndVisible" first.

my test code:

> UIWindow *windowNormal = [[UIWindow alloc]
> initWithFrame:CGRectMake(20, 20, 100, 200)];
>     windowNormal.backgroundColor = [UIColor redColor];
>     windowNormal.windowLevel = UIWindowLevelNormal + 1;
>     [windowNormal makeKeyAndVisible];
>     
>     UIWindow *windowNormal2 = [[UIWindow alloc] initWithFrame:CGRectMake(40, 40, 100, 200)];
>     windowNormal2.backgroundColor = [UIColor blueColor];
>     windowNormal2.windowLevel = UIWindowLevelNormal + 1;
>     [windowNormal2 makeKeyAndVisible];


**The test result is the red window is always in front of the blue window.**