WPF Multi Column DropDown Control

<Window x:Class="SfMultiColumnDropDownDemo.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:SfMultiColumnDropDownDemo"
        xmlns:syncfusion="http://schemas.syncfusion.com/wpf"
        mc:Ignorable="d"
        WindowStartupLocation="CenterScreen"
        Title="MainWindow" Height="450" Width="800">
    <Window.DataContext>
        <local:ViewModel/>
    </Window.DataContext>
    <Grid>
        <syncfusion:SfMultiColumnDropDownControl  x:Name="sfMultiColumn"
                                                  ItemsSource="{Binding Orders}"
                                                  DisplayMember="OrderID"
                                                  Width="175"
                                                  Height="30"/>
    </Grid>
</Window>

namespace SfMultiColumnDropDownDemo
{
    public class OrderInfo
    {
        int orderID;
        string customerId;
        string country;
        string customerName;
        string shippingCity;

        public int OrderID
        {
            get { return orderID; }
            set { orderID = value; }
        }

        public string CustomerID
        {
            get { return customerId; }
            set { customerId = value; }
        }

        public string CustomerName
        {
            get { return customerName; }
            set { customerName = value; }
        }

        public string Country
        {
            get { return country; }
            set { country = value; }
        }

        public string ShipCity
        {
            get { return shippingCity; }
            set { shippingCity = value; }
        }

        public OrderInfo(int orderId, string customerName, string country, string customerId, string shipCity)
        {
            this.OrderID = orderId;
            this.CustomerName = customerName;
            this.Country = country;
            this.CustomerID = customerId;
            this.ShipCity = shipCity;
        }
    }
    public class ViewModel
    {
        private ObservableCollection<OrderInfo> _orders;

        public ObservableCollection<OrderInfo> Orders
        {
            get { return _orders; }
            set { _orders = value; }
        }

        public ViewModel()
        {
            _orders = new ObservableCollection<OrderInfo>();
            this.GenerateOrders();
        }

        private void GenerateOrders()
        {
            _orders.Add(new OrderInfo(1001, "Maria Anders", "Germany", "ALFKI", "Berlin"));
            _orders.Add(new OrderInfo(1002, "Ana Trujilo", "Mexico", "ANATR", "Mexico D.F."));
            _orders.Add(new OrderInfo(1003, "Antonio Moreno", "Mexico", "ANTON", "Mexico D.F."));
            _orders.Add(new OrderInfo(1004, "Thomas Hardy", "UK", "AROUT", "London"));
            _orders.Add(new OrderInfo(1005, "Christina Berglund", "Sweden", "BERGS", "Lula"));
            _orders.Add(new OrderInfo(1006, "Hanna Moos", "Germany", "BLAUS", "Mannheim"));
        }
    }
}