title: Adding UIButton to MKAnnotationView
body: <p>I've a custom class of <code>MKAnnotationView</code> in which I'm trying to add 8 button to the annotation in a circular fashion.I've added the buttons.Their postion in the view is perfectly fine but the action of the buttons doesn't get called.Why the action is not getting called and what is the solution.</p>
  
  <pre><code>-(void)setSelected:(BOOL)selected animated:(BOOL)animated`
  {
      [super setSelected:selected animated:animated];
      if(selected)
      {
          UIView *circularView = [[UIView alloc]initWithFrame:CGRectMake(-55, -55, 110, 110)];
          circularView.tag = 1000;
  
          UIButton *btn1;
          UIButton *btn2;
          UIButton *btn3;
          UIButton *btn4;
          UIButton *btn5;
          UIButton *btn6;
          UIButton *btn7;
          btn1 = [UIButton buttonWithType:UIButtonTypeCustom];
          [circularView addSubview:btn1];
          btn1.userInteractionEnabled = YES;
          UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]
                                         initWithTarget:self action:@selector(buttonTapped:)];
          tap.numberOfTapsRequired = 1;
          [btn1 addGestureRecognizer:tap];
  
          btn2 = [UIButton buttonWithType:UIButtonTypeCustom];
          [circularView addSubview:btn2];
  
          btn3 = [UIButton buttonWithType:UIButtonTypeCustom];
          [circularView addSubview:btn3];
  
          btn4 = [UIButton buttonWithType:UIButtonTypeCustom];
          [circularView addSubview:btn4];
  
          btn5 = [UIButton buttonWithType:UIButtonTypeCustom];
          [circularView addSubview:btn5];
  
          btn6 = [UIButton buttonWithType:UIButtonTypeCustom];
          [circularView addSubview:btn6];
  
          btn7 = [UIButton buttonWithType:UIButtonTypeCustom];
          [circularView addSubview:btn7];
  
          [btn1 setBackgroundImage:[UIImage imageNamed:@"message-icon"] forState:UIControlStateNormal];
          [btn2 setBackgroundImage:[UIImage imageNamed:@"message-icon"] forState:UIControlStateNormal];
          [btn3 setBackgroundImage:[UIImage imageNamed:@"message-icon"] forState:UIControlStateNormal];
          [btn4 setBackgroundImage:[UIImage imageNamed:@"message-icon"] forState:UIControlStateNormal];
          [btn5 setBackgroundImage:[UIImage imageNamed:@"message-icon"] forState:UIControlStateNormal];
          [btn6 setBackgroundImage:[UIImage imageNamed:@"message-icon"] forState:UIControlStateNormal];
          [btn7 setBackgroundImage:[UIImage imageNamed:@"message-icon"] forState:UIControlStateNormal];
  
          CGPoint point = CGPointMake(55, 55);
          btn1.frame = CGRectMake(point.x - 15.00, point.y - 55.00, 30, 30);
          btn2.frame = CGRectMake(point.x + 16.27, point.y - 39.94, 30, 30);
          btn3.frame = CGRectMake(point.x + 24.00, point.y - 06.10, 30, 30);
          btn4.frame = CGRectMake(point.x + 02.36, point.y + 21.04, 30, 30);
          btn5.frame = CGRectMake(point.x - 32.36, point.y + 21.04, 30, 30);
          btn6.frame = CGRectMake(point.x - 54.00, point.y - 06.10, 30, 30);
          btn7.frame = CGRectMake(point.x - 46.27, point.y - 39.94, 30, 30);
          [self addSubview:circularView];
      }
      else
      {
          [[self viewWithTag:1000] removeFromSuperview];
      }
  }
  -(void)buttonTapped:(UITapGestureRecognizer*)sender
  {
  
  }
  </code></pre>