自定义依赖属性无法识别？

[saybookcat]

自定义了ItemsSource SelectedItems两个属性

 public static readonly DependencyProperty ItemsSourceProperty =
     DependencyProperty.Register("ItemsSource", typeof(ObservableCollection<MultiComboBoxModel>), typeof(MulitComboBoxUserControl),new UIPropertyMetadata(null));


        public ObservableCollection<MultiComboBoxModel> ItemsSource
        {
            get { return (ObservableCollection<MultiComboBoxModel>)GetValue(ItemsSourceProperty); }
            set
            {
                SetValue(ItemsSourceProperty, value);
            }
        }

        public static readonly DependencyProperty SelectedItemsProperty = DependencyProperty.Register("SelectedItems", typeof(ObservableCollection<MultiComboBoxModel>), typeof(MulitComboBoxUserControl), new PropertyMetadata(null,null));

        public ObservableCollection<MultiComboBoxModel> SelectedItems
        {
            get { return (ObservableCollection<MultiComboBoxModel>)GetValue(SelectedItemsProperty); }
            set
            {
                SetValue(SelectedItemsProperty, value);
            }
        }

用户控件定义

    <Grid>
        <ComboBox Text="{Binding SelectedText}" IsEditable="True" ItemsSource="{Binding ItemsSource}" >
            <ComboBox.ItemTemplate>
                <DataTemplate>
                    <StackPanel Orientation="Horizontal">
                        <CheckBox IsChecked="{Binding IsChecked}" Click="CheckBox_Click"/>
                        <TextBlock Text="{Binding Title}"/>
                    </StackPanel>
                </DataTemplate>
            </ComboBox.ItemTemplate>
        </ComboBox>
    </Grid>

引用时提示ItemsSource SelectedItems无法识别或被访问，是什么情况？

        <control:MulitComboBoxUserControl Grid.Row="0"  ItemsSource="{Binding ItemsSource}" SelectedItems="{Binding SelectedItems}"></control:MulitComboBoxUserControl>

[exception92]

MulitComboBoxUserControl 后台代码贴完整

[p89787259]

<ComboBox Text="{Binding SelectedText}" IsEditable="True" ItemsSource="{Binding ItemsSource}" > 你这个地方的绑定有问题吧 ItemsSource="{Binding ElementName=UserControl, Path=ItemsSource}" DataContext="{Binding ElementName=UserControl, Path=DataContext}"

[盐希瓶]

重新生成一下项目