iPhone MKMapView force callout bubble

Is it possible to force the call out bubble to be open all the time? I tried putting the following code in didAddAnnotionViews:

for (id<MKAnnotation> currentAnnotation in mapView.annotations) {       
    [mapView selectAnnotati开发者_开发百科on:currentAnnotation animated:NO];
}   

Which works, however, when I single tap the MKMapView the bubble disappear. I want to avoid this behavior.

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I don't think it is. The solution is probably to make your pin design look like your callout. Would that help ?