绑定到另一个视图模型

我正在尝试将可见性属性绑定到我在视图模型中创建的函数(MainViewModel(，但是出现此错误：

mscorlib 中发生了类型为 'System.IO.FileNotFoundException' 的第一次机会异常.dll System.Windows.Data 错误：绑定表达式路径错误："定位器"系统字符串"(哈希代码=-191326816(上找不到"主"属性。BindingExpression： Path='Main.TilesHomeViewVisible' DataItem='Locator' (hashCode=-191326816(;目标元素是"myApp.Views.TilesHomeView"(Name='myTilesHomeView'(;目标属性为"可见性"(类型为"System.Windows.Visibility"(。

根据我从错误中了解到的情况，它是在TilesHomeViewModel中寻找TilesHomeViewVisible函数，而实际上它在MainViewModel中。在绑定表达式中，如何定位MainViewModel呢？

编辑：我集成了一个"视图模型定位器"。

这是我的视图模型定位器：

    ...
    public ViewModelLocator()
    {
        ServiceLocator.SetLocatorProvider(() => SimpleIoc.Default);
        SimpleIoc.Default.Register<MainViewModel>();
        SimpleIoc.Default.Register<TilesHomeViewModel>();
    }
    public MainViewModel Main
    {
        get
        {
            return ServiceLocator.Current.GetInstance<MainViewModel>();
        }
    }
    public TilesHomeViewModel TilesVM
    {
        get
        {
            return ServiceLocator.Current.GetInstance<TilesHomeViewModel>();
        }
    }
...

我的应用程序：

<?xml version="1.0" encoding="utf-8"?>
<Application x:Class="myApp.App" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone" xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:app="clr-namespace:myApp" mc:Ignorable="d"
             xmlns:views="clr-namespace:myApp.Views"
             xmlns:vm="clr-namespace:myApp.ViewModels">
    <!--Application Resources-->
    <Application.Resources>
    <ResourceDictionary>
        <vm:ViewModelLocator x:Key="Locator" d:IsDataSource="True" />
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary>
                    <app:ColorWrapper x:Key="ColorWrapper" />
                </ResourceDictionary>
                <ResourceDictionary x:Name="ResourceDictionary1" Source="ResourceDictionary1.xaml"/>
            </ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>
    </Application.Resources>
    <Application.ApplicationLifetimeObjects>
        <!--Required object that handles lifetime events for the application-->
        <shell:PhoneApplicationService Launching="Application_Launching" Closing="Application_Closing" Activated="Application_Activated" Deactivated="Application_Deactivated" />
    </Application.ApplicationLifetimeObjects>
</Application>

在我的 主页.xaml 和链接到定位器的地方，我有：

<phone:PhoneApplicationPage
    ...
    d:DataContext="{d:DesignData SampleData/MainViewModelSampleData.xaml}"
    ...
>
    <phone:PhoneApplicationPage.DataContext>
        <Binding Path="Main" Source="{StaticResource Locator}"/>
    </phone:PhoneApplicationPage.DataContext>
    ...
    <Grid x:Name="LayoutRoot">
        ...
        <local:TilesHomeView x:Name="myTilesHomeView" Visibility="{Binding Main.TilesHomeViewVisible,Source=Locator}" />
    </Grid>
</phone:PhoneApplicationPage>      

主视图模型.cs

public class MainViewModel : ViewModelBase
    {
    public MainViewModel()
    {
        this.Items = new ObservableCollection<ItemViewModel>(); 
    }
    Visibility _tilesHomeViewVisible = System.Windows.Visibility.Collapsed;
    public Visibility TilesHomeViewVisible
    {
        get { return System.Windows.Visibility.Collapsed; }
        set { _tilesHomeViewVisible = value; RaisePropertyChanged("TilesHomeViewVisible"); }
    }
    public void TilesHomeViewClose()
    {
        TilesHomeViewVisible = System.Windows.Visibility.Collapsed;
    }
    public bool IsDataLoaded
    {
        get;
        private set;
    }
    /// <summary>
    /// Creates and adds a few ItemViewModel objects into the Items collection.
    /// </summary>
    public void LoadData()
    {...}
}

TilesHomeView.xaml的数据上下文定义如下：

<UserControl x:Class="myApp.Views.TilesHomeView"
....
DataContext="{Binding TilesVM, Source={StaticResource Locator}}"
>
    <Grid x:Name="HomeGrid">
    </Grid>
</UserControl>

家视图模型.cs没有功能，因此呈现

namespace myApp
{
    public class TilesHomeViewModel : ViewModelBase
    {
        public TilesHomeViewModel()
        {
        }
    }
}

我希望这尽可能详细。我真的希望找到解决此错误的方法，它已经困扰了我好几天了。

谢谢

<local:TilesHomeView x:Name="myTilesHomeView" Visibility="{Binding Main.TilesHomeViewVisible,Source={StaticResource Locator} }" />