MainPage.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="TicTacToeApp.MainPage">

    <Grid Padding="10"
          HorizontalOptions="Center"
          VerticalOptions="Center">
        <Grid.RowDefinitions>
            <RowDefinition Height="*" />
            <RowDefinition Height="*" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="*" />
        </Grid.ColumnDefinitions>

        <Button x:Name="Button0" ClassId="0" Grid.Row="0" Grid.Column="0" Clicked="Button_Clicked" FontSize="30"/>
        <Button x:Name="Button1" ClassId="1" Grid.Row="0" Grid.Column="1" Clicked="Button_Clicked" FontSize="30"/>
        <Button x:Name="Button2" ClassId="2" Grid.Row="0" Grid.Column="2" Clicked="Button_Clicked" FontSize="30"/>
        <Button x:Name="Button3" ClassId="3" Grid.Row="1" Grid.Column="0" Clicked="Button_Clicked" FontSize="30"/>
        <Button x:Name="Button4" ClassId="4" Grid.Row="1" Grid.Column="1" Clicked="Button_Clicked" FontSize="30"/>
        <Button x:Name="Button5" ClassId="5" Grid.Row="1" Grid.Column="2" Clicked="Button_Clicked" FontSize="30"/>
        <Button x:Name="Button6" ClassId="6" Grid.Row="2" Grid.Column="0" Clicked="Button_Clicked" FontSize="30"/>
        <Button x:Name="Button7" ClassId="7" Grid.Row="2" Grid.Column="1" Clicked="Button_Clicked" FontSize="30"/>
        <Button x:Name="Button8" ClassId="8" Grid.Row="2" Grid.Column="2" Clicked="Button_Clicked" FontSize="30"/>
    </Grid>
</ContentPage>