添加新元素时刷新属性网格集合

Question

我使用属性网格来显示软件对象的属性。 显示的属性之一是集合中元素的ID。 在属性网格中，集合显示为带有选定元素的组合框。

属性网格XAML：

      <xctk:PropertyGrid x:Name="_propertyGrid" Margin="0,2,0,0" AutoGenerateProperties="False" Grid.Row="1" Background="LightGray" ShowTitle="False" 
            PropertyValueChanged="_propertyGrid_PropertyValueChanged" SelectedObjectChanged="_propertyGrid_SelectedObjectChanged" 
            ShowSummary="False" ShowDescriptionByTooltip="True" Grid.RowSpan="2" IsManipulationEnabled="True" UseLayoutRounding="True" 
            SelectedPropertyItemChanged="_propertyGrid_SelectedPropertyItemChanged" >
                <xctk:PropertyGrid.PropertyDefinitions>
                    <xctk:PropertyDefinition TargetProperties="Id" />
                    <xctk:PropertyDefinition TargetProperties="BGColor" Category=" Colors" DisplayName="Background"   DisplayOrder="1"/>
                    <xctk:PropertyDefinition TargetProperties="FGColor" Category=" Colors" DisplayName="Foreground"   DisplayOrder="2" />

                    <xctk:PropertyDefinition TargetProperties="PosX" Category=" Layout"   DisplayOrder="0"/>
                    <xctk:PropertyDefinition TargetProperties="PosY" Category=" Layout"   DisplayOrder="1"/>
                    <xctk:PropertyDefinition TargetProperties="Width" Category=" Layout"  DisplayOrder="2"/>
                    <xctk:PropertyDefinition TargetProperties="Height" Category=" Layout" DisplayOrder="3"/>
                    <xctk:PropertyDefinition TargetProperties="Type"                      DisplayOrder="0"/>
                    <!--<xctk:PropertyDefinition TargetProperties="SourceTable"           DisplayOrder="10"  DisplayName="Ext Format"  />-->
                    <xctk:PropertyDefinition TargetProperties="StrSourceTable"            DisplayOrder="10"  DisplayName="Ext Format"  />
                    <xctk:PropertyDefinition TargetProperties="FontSizes"                 DisplayOrder="4"/>
                    <!-- Label Specific Properties -->
                    <xctk:PropertyDefinition TargetProperties="Text"                      DisplayOrder="4"/>
                    <!-- Data Properties -->
                    <xctk:PropertyDefinition TargetProperties="Data"                      DisplayOrder="3"/>
                    <xctk:PropertyDefinition TargetProperties="Data2"                     DisplayOrder="4" DisplayName="Data Y" />

                    // THE ID SIMPLE TOUCH PROPERTY HERE :     
                    <xctk:PropertyDefinition TargetProperties="IDActionSimpleTouch"       DisplayOrder="3" DisplayName="Simple Touch" />

                    <xctk:PropertyDefinition TargetProperties="IDActionDoubleTouch"       DisplayOrder="4" DisplayName="Double Touch" />
                    <xctk:PropertyDefinition TargetProperties="IDActionLongTouch"         DisplayOrder="5" DisplayName="Long Touch" />

绑定对象中的属性：

    [XmlIgnore]
    private UInt16 _IDActionSimpleTouch = 0;
    [XmlAttribute]
    [ItemsSource(typeof(UserEventItemSource))]
    [RefreshProperties(RefreshProperties.All)]
    public UInt16 IDActionSimpleTouch
    {
        get { return _IDActionSimpleTouch; }
        set
        {
            _IDActionSimpleTouch = value;
            this.PropertyChangedNotify("IDActionSimpleTouch");
        }
    }

商品来源定义：

class UserEventItemSource : IItemsSource
{
    public ItemCollection GetValues()
    {
        ItemCollection ActionsDatas = new ItemCollection();
        if (UserEventInfos.ListeUserEvent.Find(x => x == "OFF") == null) UserEventInfos.ListeUserEvent.Insert((UInt16) 0, "OFF");
        foreach (string s in UserEventInfos.ListeUserEvent) if(s != null) ActionsDatas.Add((UInt16)UserEventInfos.ListeUserEvent.IndexOf(s), s);
        return ActionsDatas;
    }
}

属性网格中的结果是：

问题是当我在此列表中添加新元素时。它不显示新元素。 我不知道在发出属性更改通知时如何强制更新itemsource集合。

谢谢您的帮助