private void LoadShelves(XmlDocument xDoc)
        {
            XmlNodeList verticalShelves = xDoc.GetElementsByTagName("VerticalShelve");

            for (int i = 0; i < verticalShelves.Count; i++)
            {
                LevelObject obj = new LevelObject(_content, Int32.Parse(verticalShelves[i].FirstChild.InnerText), Int32.Parse(verticalShelves[i].LastChild.InnerText), "shelfVertical");
                shelves.Add(obj);
            }
            XmlNodeList horizontalShelves = xDoc.GetElementsByTagName("HorizontalShelve");

            for (int i = 0; i < horizontalShelves.Count; i++)
            {
                LevelObject obj = new LevelObject(_content, Int32.Parse(horizontalShelves[i].FirstChild.InnerText), Int32.Parse(horizontalShelves[i].LastChild.InnerText), "shelf");
                shelves.Add(obj);
            }
        }
        private void LoadCashier(XmlDocument xDoc)
        {
            XmlNodeList cashierEl = xDoc.GetElementsByTagName("Cashier");

            cashier = new LevelObject(_content, Int32.Parse(cashierEl[0].FirstChild.InnerText), Int32.Parse(cashierEl[0].LastChild.InnerText), "cashier");
        }