title: dismissWithClickedButtonIndex not work in toolbar IOS 8
body: <p>I set a PickView and a <code>ToolBar</code> in UIActionSheet The ToolBar has a <code>UIBarButtonItem</code> in order to close UIActionSheet, when I click the UIBarButtonItem the <code>UIActionSheet</code> should be dismissed
  But I founded that When I click the Done Button The UIActionSheet still display in view</p>
  
  <pre><code>@IBOutlet weak var _gradeResign: UITextField!
  override func viewDidLoad() {
  
      _gradeResign.resignFirstResponder()
      self.m_actionSheet = UIActionSheet(title: "", delegate: self, cancelButtonTitle: nil, destructiveButtonTitle:nil,otherButtonTitles:"");
      self.m_actionSheet.delegate = self;
      self.m_actionSheet.bounds = CGRectMake(0, 0, self.view.frame.width, self.view.frame.height/3)
      self.m_actionSheet.actionSheetStyle = UIActionSheetStyle.Default;
      var pickerDataToolbar = UIToolbar(frame: CGRectMake(0, 0, self.m_actionSheet.frame.width, self.m_actionSheet.frame.height))
      pickerDataToolbar.barStyle = UIBarStyle.Default;
      pickerDataToolbar.sizeToFit();
      var barItmes:NSMutableArray = NSMutableArray();
      var doneBtn:UIBarButtonItem = UIBarButtonItem(title: "Done", style:UIBarButtonItemStyle.Bordered, target: self, action:Selector("toolBarDoneClick"))
      barItmes.addObject(doneBtn)
      var flexSpace:UIBarButtonItem = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.FixedSpace,target: self, action: nil)
      barItmes.addObject(flexSpace)
      pickerDataToolbar.setItems(barItmes, animated: true)
      m_actionSheet.addSubview(pickerDataToolbar)
      gradePickerView = UIPickerView(frame: CGRectMake(0, 44, self.m_actionSheet.bounds.size.width,self.m_actionSheet.bounds.size.height))
      gradePickerView.showsSelectionIndicator = true;
      gradePickerView.dataSource = self;
      gradePickerView.delegate = self;
      gradePickerView.selectRow(1, inComponent: 0, animated: true)
      self.m_actionSheet.addSubview(gradePickerView)
      self.m_actionSheet.showInView(self.view)
      self.m_actionSheet.showFromToolbar(pickerDataToolbar);
      _gradeResign.inputView = self.m_actionSheet;
  }
  
  func toolBarDoneClick(){
  
      self.m_actionSheet.dismissWithClickedButtonIndex(0, animated: true)
  }
  </code></pre>
  
  <p>The function <code>toolBarDoneClick</code> run current</p>