/// <summary>
        /// This assigns an instance of the car inventory taker form.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void WindowOpenCarInventory(object sender, EventArgs e)
        {
            // Create (or call) the customer entry instance.
            formCarInventory carInventoryInstance = formCarInventory.Instance;

            // Assign this child window an MdiParent
            carInventoryInstance.MdiParent = this;

            // Display the existing or created instance.
            carInventoryInstance.Show();
            carInventoryInstance.Focus();
        }
        /// <summary>
        /// This event will open formCarInventory
        /// </summary>
        private void openCarListWindowsMenuClick(object sender, EventArgs e)
        {
            // create formCarInventory object
            formCarInventory carForm = formCarInventory.Instance;

            // It is a child of a main form
            carForm.MdiParent = this;

            // Show the form
            carForm.Show();
            // Set focus to it
            carForm.Focus();
        }