/// <summary>
    /// Raises the tap began event for the tapped input block.
    /// </summary>
    /// <param name='touchPos'>
    /// Touch position.
    /// </param>
    protected void OnTapBegan(Vector2 touchPos)
    {
        InputBlock block = GetInputBlock(touchPos);

        if (block != null)
        {
            block.OnTapBegan(touchPos);
        }
    }