MKMapView: Pins over the pop up

This question was asked earlier by someone else but never answered: MKAnnotation - Map Pin callout pops up behind other map pins.

I ran into this problem yesturday and I have no clue what caused this problem and was hoping someone else has had this problem but figure开发者_StackOverflow社区d it out.

alt text http://img43.imageshack.us/img43/78/screenshot20100119at938.jpg

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Might want to take a look at the responses here:

Z-ordering of MKAnnotationViews