Powershell上带有onclick按钮的Xaml网格上的重叠按钮

<Window x:Class="MyApp.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*"/>
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>

        <Button Grid.Row="0" Grid.Column="0" Content="Button 1" Click="Button_Click"/>
        <Button Grid.Row="0" Grid.Column="1" Content="Button 2" Click="Button_Click"/>
        <Button Grid.Row="1" Grid.Column="0" Content="Button 3" Click="Button_Click"/>
        <Button Grid.Row="1" Grid.Column="1" Content="Button 4" Click="Button_Click"/>
    </Grid>
</Window>

Add-Type -TypeDefinition @"
using System.Windows;
using System.Windows.Controls;

namespace MyApp
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            MessageBox.Show("Button clicked!");
        }
    }
}
"@

[MyApp.MainWindow]::new().ShowDialog()