To clarify and based on what you say, you want to customize the appearance of the CALLOUT bubble, which shows the title / subtitles, and not the annotation view itself, is this correct?
, MKAnnotationView - image/icon/, . /, , , , , -
, , , iPhone, , .
, , ... http://blog.asolutions.com/2010/09/building-custom-map-annotation-callouts-part-1/ p >