MainWindow.xaml

<Window x:Class="AMD_test.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>
        <ListBox Height="251" HorizontalAlignment="Left" Margin="203,24,0,0" Name="lb" VerticalAlignment="Top" Width="279" SelectionMode="Multiple" />
        <Button Content="Test" Height="33" HorizontalAlignment="Left" Margin="21,29,0,0" Name="test" VerticalAlignment="Top" Width="93" Click="Test_Click" />
    </Grid>
</Window>