把wpf控件放在win32控件之上

Question

我有一个win32窗口，我在WPF窗口中托管，我需要在该窗口的顶部放置另一个控件（类似于视频和字幕在它上面） 但由于某种原因，我没有看到我放在窗户上的控制。 这是我到目前为止所得到的：

<Grid>
    <Border Name="ControlHostElement" Background="Black" SizeChanged="ControlHostElement_SizeChanged" />
    <View:MospView />
</Grid>

VideoHostControl是HwndHost类

    public static readonly DependencyProperty VideoWindowProperty =
        DependencyProperty.Register("VideoWindow", typeof(IntPtr), typeof(VideoView),
        new FrameworkPropertyMetadata(IntPtr.Zero, new PropertyChangedCallback(VideoWindowChanged)));

    public IntPtr VideoWindow
    {
        get { return (IntPtr)GetValue(VideoWindowProperty); }
        set { SetValue(VideoWindowProperty, value); }
    }

    private static void VideoWindowChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
    {
        VideoView view = sender as VideoView;
        if (view == null) return;
        view.ControlHostElement.Child = view.VideoHost = new VideoHostControl(view.VideoWindow);
        view.ControlHostElement_SizeChanged(sender, null);
    }

    private void ControlHostElement_SizeChanged(object sender, SizeChangedEventArgs e)
    {
        if (VideoHost != null)
        {
            double width = viewBoxWraper.ActualWidth * ControlHostElement.ActualWidth / grid.ActualWidth;
            double height = viewBoxWraper.ActualHeight * ControlHostElement.ActualHeight / grid.ActualHeight;
            VideoHost.Resize((int)width, (int)height);
        }
    }