title: how to hide rightCalloutAccessoryView for some annotation "disclosure button"
body: <p>i have only one class for the annotation ..</p>
  
  <p>for one reason, the annotation show only the title, and it have different pinColor  and i did that very well by declaring a method in annotation class ..</p>
  
  <p>but i want to hide the disclosure button for the same reason ..</p>
  
  <p>i only know that the rightCalloutAccessoryView can be declared with viewForAnnotation method in my mapview class </p>
  
  <p>So what can i do?
  how to change the view for the callout by hiding the disclosure button ?</p>