c# - WPF、C# - CheckEdit で SelectAll

Question

全選択の作り方CheckEdit。

Xaml が自動的に生成するcheckEdit

   <ItemsControl ItemsSource="{Binding MyProperty, Mode=TwoWay}" Margin="0"  Grid.Column="1" Grid.RowSpan="1" x:Name="MyCheck" >
        <ItemsControl.ItemTemplate>
            <DataTemplate>
                <dxe:CheckEdit Content="{Binding FilePath, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Padding="2.5" Margin="3"  
                               IsChecked="{Binding IsChecked, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />
            </DataTemplate>
        </ItemsControl.ItemTemplate>
        <ItemsControl.ItemsPanel>
            <ItemsPanelTemplate>
                <WrapPanel Orientation="Vertical"  />
            </ItemsPanelTemplate>
        </ItemsControl.ItemsPanel>
    </ItemsControl>

        <Button x:Name="filtrButton" Content="Filtr" Command="{Binding FiltrCommand}"  Padding="5" Margin="3" IsEnabled="{Binding IsEnabled}"/>
        <dxe:CheckEdit x:Name="CheckALL" Content="Select All" Padding="2.5" Margin="3" IsChecked="{Binding AllSelected}" />

C#

        private bool? _allSelected = true;
    public bool? AllSelected
    {
        get { return _allSelected; }
        set
        {
            _allSelected = value;

          MyProperty.ForEach(x => x.IsChecked = value);

            OnPropertyChange("AllSelected");
        }
    }
    public List<MyCheckBox> MyProperty
    {
        get { return TempList; }
        set
        {
            TempList = value;
            OnPropertyChange("MyProperty");
        }
    }
/// добавление название файла и его select
        public ViewModel(){
       TempList = new List<MyCheckBox>();

        foreach (var type in tempUniqueList)
        {
            TempList.Add(new MyCheckBox(type, _allSelected));
        }

        MyProperty = TempList;
    }