Force willAnimateRotationToInterfaceOrientation method

I want to call willAnimateRotationToInterfaceOrientation method when my app starts, how can I force this method toe execute? It's only invoked when I rotate device now :(

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

One detail... when device is in horizontal mode it is called but when I start with device in ver开发者_Go百科tical mode this method is never invoked :(

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Why don't you just set your orientation to UISupportedInterfaceOrientations in the Info.plist file?