WPF DataTemplate / DataTemplateSelector —由2个不同的View使用的ViewModel的最佳方法？

FooViewModel : BaseViewModel

BarViewModel : BaseViewModel

MainView

FooView

BarView

DataTemplate

DataTemplateSelector

DataContext

ItemsControl

ItemSource

ObservableCollection<BaseViewModel>

FooViewModel

BarViewModel

DataTemplate

DataTemplateSelector

public abstract class BaseViewModel : NotificationObject
{
    //Common Stuff
}

public abstract MainViewModel : NotificationObject
{
    public MainViewModel()
    {
        MyItems = new ObservableCollection<BaseViewModel>()
        {
            new FooViewModel();
            new BarViewModel();
            new FooViewModel(); //New Item -- I want it to use the DifferentFooView
        }
        //Load items from a DAL later
    }

    public ObservableCollection<BaseViewModel> MyItems { get; set; }

    //Other Stuff
}

<l:MyItemsControl ItemSource={Binding MyItems} ContentTemplateSelector={StaticResource MyTemplateSelector} />