InputTransparent = true在Frame中不起作用吗？

Question

简单的页面内容：包含框架和一些按钮的外部布局。框架包含stackLayout，stacklayout内部是一些标签。

<ContentPage.Content>
    <StackLayout x:Name="outLayout">
        <Frame  x:Name="frame"  
                HasShadow="True"
                BackgroundColor="White"
                OutlineColor="Gray"
                Margin="16,0,16,0">
            <StackLayout x:Name="innerLayout" BackgroundColor="Red">
                <Label Text="Testing" FontAttributes="Bold" FontSize="Large" InputTransparent="True"/>
                <Label Text="Testing" FontSize="Small" InputTransparent="True"/>
            </StackLayout>
        </Frame>
        <Button Text="Frame handle tap event" Clicked="Button_Clicked"></Button>
        <Button Text="inner Layout handle tap event" Clicked="Button_Clicked_1"></Button>
        <Button Text="out layout handle tap event" Clicked="Button_Clicked_2" />
    </StackLayout>
</ContentPage.Content>

代码隐藏我有一个TapGesture事件，如果点击某个视图，只需记录一条消息。

 public TestInputTransparent()
    {

        InitializeComponent();
        var tapGesture = new TapGestureRecognizer();
        tapGesture.Tapped += TapGesture_Tapped;

        innerLayout.GestureRecognizers.Add(tapGesture);
        frame.GestureRecognizers.Add(tapGesture);
        outLayout.GestureRecognizers.Add(tapGesture);
    }

    private void TapGesture_Tapped(object sender, EventArgs e)
    {
        if (sender is StackLayout) {
            Debug.WriteLine(" stacklayout Tapped");
        } else if (sender is Frame) {
            Debug.WriteLine( " frame Tapped");
        } 
    }

    private void Button_Clicked(object sender, EventArgs e)
    {
        innerLayout.InputTransparent = true;
    }

    private void Button_Clicked_1(object sender, EventArgs e)
    {
        innerLayout.InputTransparent = false;
    }

    private void Button_Clicked_2(object sender, EventArgs e)
    {
        frame.InputTransparent = true;
    }

我的期望是任何tap事件都将由out stackLayout处理，无论out stackLayout的子节点是否收到tap事件。

当我点击按钮＆＃34;框架手柄点击事件＆＃34;时，我设置了innerLayout.InputTransparent = true;，因此点击事件将由帧处理。我可以通过单击第二个按钮将其设置回来。但是当我设置frame.InputTransparent = true;时，点击事件仍然留在框架元素中。帧不会交给out stackLayout。为什么？框架是特例吗？