WPF 多个选项卡TabControl 页面分离

<Window x:Class="WpfApp1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApp1"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <TabControl>
            <TabItem Header="Page1">
                <Frame Source="/WpfApp1;component/Pages/Page1.xaml"/>
            </TabItem>
            <TabItem Header="Page2">
                <Frame Source="/WpfApp1;component/Pages/Page2.xaml"/>
            </TabItem>
            <TabItem Header="Page3">
                <Frame Source="/WpfApp1;component/Pages/Page3.xaml"/>
            </TabItem>
        </TabControl>
    </Grid>
</Window>

<Page x:Class="WpfApp1.Pages.Page1"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
      xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
      xmlns:local="clr-namespace:WpfApp1.Pages"
      mc:Ignorable="d" 
      d:DesignHeight="450" d:DesignWidth="800"
      Title="Page1">

    <Grid>
        <Button Click="Button_Click" Content="Page1" HorizontalAlignment="Left" Margin="213,124,0,0" VerticalAlignment="Top" Width="75" />
    </Grid>
</Page>

namespace WpfApp1.Pages
{
    /// <summary>
    /// Page1.xaml 的交互逻辑
    /// </summary>
    public partial class Page1 : Page
    {
        public Page1()
        {
            InitializeComponent();
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            MessageBox.Show("页面1按键事件！");
        }
    }
}