wpf LookUpEdit PopupContentTemplate

<dxg:LookUpEdit
                Name="searchLookUpEdit" 
                HorizontalAlignment="Stretch" 
                PopupHeight="500" 
                PopupWidth="750" 
                PopupMinHeight="100" 
                PopupMinWidth="100" 
                IsPopupAutoWidth="False" 
                FilterCondition = "StartsWith" 
                FindButtonPlacement = "Popup"
                FindMode = "Always" 
                ShowSizeGrip = "True" 
                PopupContentTemplate="{StaticResource gridTemplate}" 
                ItemsSource="{Binding Path=PeopleInfoArray}" 
                AutoPopulateColumns="False" 
                DisplayMember="Name" 
                ValueMember="Id" 
                >
            <dxg:LookUpEdit.StyleSettings>
                <dxg:SearchLookUpEditStyleSettings />
            </dxg:LookUpEdit.StyleSettings>
        </dxg:LookUpEdit>

 <ControlTemplate x:Key="popupContentTemplate">
                <dxg:GridControl x:Name="PART_GridControl" AutoExpandAllGroups="True">
                    <dxg:GridControl.Columns>
                        <dxg:GridColumn FieldName="Id" />
                        <dxg:GridColumn FieldName="PId" />
                        <dxg:GridColumn FieldName="Name" />
                        <dxg:GridColumn FieldName="BirthDate" />
                        <dxg:GridColumn FieldName="Age" Width="60" FixedWidth="True" />
                    </dxg:GridControl.Columns>
                    <dxg:GridControl.View>
                        <dxg:TableView
                        Name="View" 
                        ShowGroupedColumns="True" 
                        AutoWidth="True" 
                        AllowPerPixelScrolling="True" 
                        ScrollAnimationDuration="0" 
                        ShowAutoFilterRow="True" 
                        ShowTotalSummary="True" 
                        IsSynchronizedWithCurrentItem="False">
                        </dxg:TableView>
                    </dxg:GridControl.View>
                </dxg:GridControl>
            </ControlTemplate>

/// <summary>
    /// LookupControl.xaml 的交互逻辑
    /// </summary>
    public partial class LookupControl : Window
    {
        public LookupControl()
        {
            InitializeComponent();
            LookupControlViewModel viewModel = new LookupControlViewModel();

            this.DataContext = viewModel;
        }
    }

 /// <summary>
    /// Lookup 控件ViewModel
    /// </summary>
    public class LookupControlViewModel : DxslViewModelBase
    {
        /// <summary>
        /// 人员信息集合
        /// </summary>
        public ObservableCollection<PersonInfo> PeopleInfoArray { get; set; }

        public LookupControlViewModel()
        {
            PeopleInfoArray = Dxsl.InitDataBase.FackDataBaseLayer.GetPeopleFromDatabase();
        }
    }

public class FackDataBaseLayer
    {
        /// <summary>
        /// 获取人员信息
        /// </summary>
        /// <returns></returns>
        public static ObservableCollection<PersonInfo> GetPeopleFromDatabase()
        {
            //Simulate database extaction
            //For example from ADO DataSets or EF
            return new ObservableCollection<PersonInfo>
            {
                new PersonInfo {Age=78 , Id= "1", PId="0", Address="北京市海淀区",  Name="王爷爷"  },
                new PersonInfo {Age=55 , Id="2", PId="1",  Address="北京市海淀区",  Name="王父亲"  },
                new PersonInfo {Age=26 , Id="3", PId="2",  Address="北京市海淀区",  Name="王一"  },
                new PersonInfo {Age=22 , Id="4",PId="2",   Address="北京市海淀区",  Name="王二"  },
                new PersonInfo {Age=25 , Id="5",PId="2",   Address="北京市海淀区",  Name="王三"  }
            };
        }
    }

 /// <summary>
    /// 人员信息
    /// </summary>
    public class PersonInfo : DxslModelBase
    {
        #region 字段
        private string _id;
        private string _pId;
        private string _name;
        private int _age;
        private string _address;
        #endregion

        #region 属性
        /// <summary>
        /// 自增Id
        /// </summary>
        public string Id
        {
            get { return _id; }
            set { _id = value; NotifyPropertyChanged("Id"); }
        }
        /// <summary>
        /// 父级Id
        /// </summary>
        public string PId
        {
            get { return _pId; }
            set { _pId = value; NotifyPropertyChanged("PId"); }
        }
        /// <summary>
        /// 姓名
        /// </summary>
        public string Name
        {
            get { return _name; }
            set { _name = value; NotifyPropertyChanged("Name"); }
        }
        /// <summary>
        /// 年龄
        /// </summary>
        public int Age
        {
            get { return _age; }
            set { _age = value; NotifyPropertyChanged("Age"); }
        }
        /// <summary>
        /// 地址
        /// </summary>
        public string Address
        {
            get { return _address; }
            set { _address = value; NotifyPropertyChanged("Address"); }
        }
        #endregion

        #region 构造函数
        public PersonInfo()
        {

        }
        #endregion

        #region 方法

        #endregion
    }

 /// <summary>
    /// Dxsl类model基类
    /// </summary>
    public class DxslModelBase : INotifyPropertyChanged
    {
        #region NotifyPropertyChanged
        public event PropertyChangedEventHandler PropertyChanged;
        /// <summary>
        /// 属性通知
        /// </summary>
        /// <param name="property">属性名称</param>
        public void NotifyPropertyChanged(string property)
        {
            if (this.PropertyChanged != null)
                this.PropertyChanged(this, new PropertyChangedEventArgs(property));
        }
        #endregion
    }

 public class DxslViewModelBase : INotifyPropertyChanged
    {
        #region NotifyPropertyChanged
        public event PropertyChangedEventHandler PropertyChanged;
        /// <summary>
        /// 属性通知
        /// </summary>
        /// <param name="property">属性名称</param>
        public void NotifyPropertyChanged(string property)
        {
            if (this.PropertyChanged != null)
                this.PropertyChanged(this, new PropertyChangedEventArgs(property));
        }
        #endregion
    }