- (BOOL)                         gestureRecognizer: (UIGestureRecognizer*)gestureRecognizer
shouldRecognizeSimultaneouslyWithGestureRecognizer: (UIGestureRecognizer*)otherGestureRecognizer
{
    if ([gestureRecognizer isKindOfClass: [UIPanGestureRecognizer class]])
    {
        if ([((UIPanGestureRecognizer*)gestureRecognizer) velocityInView: self].y > 0)
        {
            // Up
            if (self.contentOffset.y <= 0)
            {
                self.bounces = NO;
                return YES;
            }
        }
        else
        {
            // Down
            if (self.contentOffset.y + self.height >= self.contentSize.height)
            {
                self.bounces = NO;
                return YES;
            }
        }
    }

    self.bounces = YES;

    return NO;
}