如何在MasterDetailPage XamarinForms中插入方法

public partial class App : Application
{
    public App()
    {
        InitializeComponent();

        MainPage = new MainPage();
    }
}

public partial class MainPage : MasterDetailPage
{
    public MainPage()
    {
        InitializeComponent();

        Master = new MasterPage();
        Detail = new NavigationPage(new DetailPage());
    }
}

public partial class MasterPage : ContentPage
{
    public MasterPage()
    {
        InitializeComponent();
    }
}

public partial class DetailPage : ContentPage
{
    public DetailPage()
    {
        InitializeComponent();
    }
}

public partial class MasterPage : ContentPage
{
    public MasterPage()
    {
        InitializeComponent();

        var button1 = new Button { Text = "菜单项1" };
        button1.Clicked += OnMenuItem1Clicked;
        var button2 = new Button { Text = "菜单项2" };
        button2.Clicked += OnMenuItem2Clicked;

        Content = new StackLayout
        {
            Children = { button1, button2 }
        };
    }

    private void OnMenuItem1Clicked(object sender, EventArgs e)
    {
        // 在此处插入菜单项1的方法逻辑
    }

    private void OnMenuItem2Clicked(object sender, EventArgs e)
    {
        // 在此处插入菜单项2的方法逻辑
    }
}

public partial class DetailPage : ContentPage
{
    public DetailPage()
    {
        InitializeComponent();

        Content = new Label { Text = "详细内容" };
    }
}