Caliburn微导航与IoC

如果我有一个视图模型，如:

public interface IMainMenuViewModel
{
    bool CanDoAction1 { get; }
    void DoAction1();
}
public class MainMenuViewModel : Conductor<IScreen> , IMainMenuViewModel
{
    public bool CanDoAction1
    {
        get { return true; }
    }
    public void DoAction1()
    {
        //perform action
    }
}

如何将它注入父视图模型?IMainMenuViewModel接口没有指定任何导体属性，所以我不能在isscreen的位置使用它，这失败了:

public class ShellViewModel : Conductor<IScreen>.Collection.OneActive, IShellViewModel
{
    public ShellViewModel(IMainMenuViewModel mainMenuViewModel)
    {
        ActivateItem(mainMenuViewModel); //mainMenuViewModel is not an IScreen
    }
}

是正确的事情做继承IScreen在我的视图模型接口?即:

public interface IMainMenuViewModel : IScreen
{
    bool CanDoAction1 { get; }
    void DoAction1();
}