问题：两个checkbox更新后，绑定的属性并没有更新，请教各位大神带这么解决？只有200分，如果哪位能解决，全部奉上
代码如下：
view(XAML文件)：
 <UserControl.Resources>
        <ResourceDictionary>
             <local:ShowConverter x:Key="sc"/>
         </ResourceDictionary>
    </UserControl.Resources>
<CheckBox Content="{Binding BSM.Commander_BTNMain.Name}" IsChecked="{Binding BSM.Commander_BTNMain.IsSelected}" >
 <CheckBox Content="{Binding BSM.Commander_BTNSub.Name}" Grid.Column="1" IsChecked="{Binding BSM.Commander_BTNSub.IsSelected}" />
<Label>
 <Label.Content>
     <Label Grid.Column="1">
                <Label.Content>
                    <MultiBinding Converter="{StaticResource sc}">
                        <Binding Path="BSM.Commander_BTNMain" Mode="OneWay"/>
                        <Binding Path="BSM.Commander_BTNSub"/>
                    </MultiBinding>
                </Label.Content>
            </Label>
Model:
  public class ICheckItem : BindableBase
    {
        /// <summary>
        ///当前项是否选中
        ///</summary>
        private bool isSelected;
        public bool IsSelected
        {
            get { return isSelected; }
            set
            {
                SetProperty(ref isSelected, value);
            }
        } /// <summary>
          ///名称
          ///</summary>
        public string Name { get; set; }
    }

    public class BTNSysDeployModel : BindableBase
    {    //主车
        private ICheckItem commander_BTNMain = new ICheckItem();

        public ICheckItem Commander_BTNMain
        {
            get { return commander_BTNMain; }
            set
            {
                SetProperty(ref commander_BTNMain, value);
            }
        }
        //副车
        private ICheckItem commander_BTNSub = new ICheckItem();

        public ICheckItem Commander_BTNSub
        {
            get { return commander_BTNSub; }
            set
            {
                SetProperty(ref commander_BTNSub, value);
            }
        }
}
转换器：
 public class ShowConverter : IMultiValueConverter
    {
        public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
        {
            string show = "";
            foreach (var item in values)
            {
                if (item is ICheckItem)
                {
                    ICheckItem ic = (ICheckItem)item;
                    if (ic.IsSelected)
                    {
                        show += ic.Name + "   ";
                    }
                }
            }

            return show;
        }

        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }