Unable to set title to clustered annotation

[ravinleague]

Hi I am able to group the annotations but not able to show the title.

let a:FBAnnotation = FBAnnotation()
a.title = "Some Title"
a.coordinate = CLLocationCoordinate2D(latitude: ((lat as? NSString)?.doubleValue)!, longitude:((lng as? NSString)?.doubleValue)!)
self.array.append(a)