How to set the autoresize property to change according to orientation in iPhone?

I have an application created with a root class to be UIViewController class. I have placed one button on its view with frame size fixed in the view and have also set:

    -(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
        return YES;
}

Now when i rotate the button remains in the same place except it is turned up. If i set 开发者_开发知识库the autoresizing will the UIButton appears in the proper position. If so how to set the autoresizing??

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Why don't you start here with moving and resizing objects

http://developer.apple.com/mac/library/documentation/DeveloperTools/Conceptual/IB_UserGuide/Layout/Layout.html#//apple_ref/doc/uid/TP40005344-CH19-SW1