//TODO: Step 13 - Listen for the Checkmark gesture
        protected void WireUpCheckmarkGestureRecognizer()
        {
            // create the recognizer
            checkmarkGesture = new CheckmarkGestureRecognizer();

            // wire up the event handler
            checkmarkGesture.AddTarget(() =>
            {
                //TODO: Step 14 - Check the state of the gesture
                if (checkmarkGesture.State != UIGestureRecognizerState.Recognized ||
                    checkmarkGesture.State != UIGestureRecognizerState.Ended)
                    return;

                BeginInvokeOnMainThread(() =>
                {
                    imgCheckmark.Image = UIImage.FromBundle(
                        isChecked
                            ? "Images/CheckBox_Checked.png"
                            : "Images/CheckBox_Unchecked.png");
                });

                isChecked = !isChecked;
            });

            //TODO: Step 15 - Add the gesture to the view
            View.AddGestureRecognizer(checkmarkGesture);
        }
 protected void WireUpCheckmarkGestureRecognizer()
 {
     // create the recognizer
     checkmarkGesture = new CheckmarkGestureRecognizer();
     // wire up the event handler
     checkmarkGesture.AddTarget(() =>{
         if (checkmarkGesture.State == (UIGestureRecognizerState.Recognized | UIGestureRecognizerState.Ended))
         {
             if (isChecked)
             {
                 imgCheckmark.Image = UIImage.FromBundle("Images/CheckBox_Unchecked.png");
             }
             else
             {
                 imgCheckmark.Image = UIImage.FromBundle("Images/CheckBox_Checked.png");
             }
             isChecked = !isChecked;
         }
     });
     // add the gesture recognizer to the view
     View.AddGestureRecognizer(checkmarkGesture);
 }