Inheritance: CatPaw.TerrainData
        protected override void OnShow(object userData)
        {
            base.OnShow(userData);

            m_TerrainBrickData = userData as TerrainBrickData;
            if (m_TerrainBrickData == null)
            {
                throw new GameFrameworkException();
            }
        }
        protected override void OnHide(object userData)
        {
            m_TerrainBrickData = null;

            base.OnHide(userData);
        }