シンプルなTabbedPageです。

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ファイル --> 新規作成 --> プロジェクト(P)... --> Cross-Platform --> Xamarin-Forms で作成

TabbedPage02

TabPage.cs FirstPage.cs SecondPage.cs ThirdPage.cs クラスの追加

TabPage.csの書き換え

using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection.Emit;
using System.Text;

using Xamarin.Forms;

namespace TabbedPage02
{
public class TabPage : TabbedPage
{
public TabPage()
{
this.Title = "Tabs Using TabbedPage";
this.Children.Add(new FirstPage());
this.Children.Add(new SecondPage());
this.Children.Add(new ThirdPage());
}
}
}

FirstPage.cs サブクラスの記述

using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection.Emit;
using System.Text;

using Xamarin.Forms;

namespace TabbedPage02
{
public class FirstPage : ContentPage
{
Button firstButton;

public FirstPage()
{
Title = "First Page";

Label homeLabel = new Label
{
Text = "First Page",
FontSize = 40
};

firstButton = new Button
{
Text = "Go to Second Page"
};

firstButton.Clicked += async (sendernav, args) =>
await Navigation.PushModalAsync(new SecondPage());

var stackLayout = new StackLayout
{
Children = { homeLabel, firstButton }

};

this.Content = stackLayout;

Application.Current.Properties["id"] = 12345;
}
}
}

SecondPage.cs の追加

using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection.Emit;
using System.Text;

using Xamarin.Forms;

namespace TabbedPage02
{
public class SecondPage : ContentPage
{
Button secondButton;

public SecondPage()
{
Title = "Second Page";

Label homeLabel = new Label
{
Text = "Second Page",
FontSize = 40
};

secondButton = new Button
{
Text = "Go to Third Page"
};

secondButton.Clicked += async (sendernav, args) =>
await Navigation.PushModalAsync(new ThirdPage());

var stackLayout = new StackLayout
{
Children = { homeLabel, secondButton }

};

this.Content = stackLayout;
}
}
}

ThirdPage.cs の追加

using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection.Emit;
using System.Text;

using Xamarin.Forms;

namespace TabbedPage02
{
public class ThirdPage : ContentPage
{
public ThirdPage()
{
Title = "Third Page";

Label homeLabel = new Label
{
Text = "Third Page",
FontSize = 40
};

var stackLayout = new StackLayout
{
Children = { homeLabel }
};

this.Content = stackLayout;
}
}
}

App.cs の書き換え

App.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using Xamarin.Forms;

namespace TabbedPage02
{
public class App : Application
{
public App()
{
// The root page of your application
MainPage = new TabPage();
}

}
}