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How to define behavior of a control in a separate .cs file (in WPF)?

<Window x:Class="Modulated.MainWindow"

    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

    Title="MainWindow" Height="194" Width="525">

<Grid>

    <Button Content="Sort Asc" Height="23" HorizontalAlignment="Left" Margin="10,12,0,0" Name="button3" VerticalAlignment="Top" Width="75" Click="sort_asc" />

    <Button Content="Sort Desc" Height="23" HorizontalAlignment="Left" Margin="12,42,0,0" Name="button4" VerticalAlignment="Top" Width="75" />

    <ListBox Height="131" HorizontalAlignment="Left" Margin="99,12,0,0" Name="listBox1" VerticalAlignment="Top" Width="70" >

        <ListBoxItem>1</ListBoxItem>

        <ListBoxItem>2</ListBoxItem>

        <ListBoxItem>3</ListBoxItem>

    </ListBox>

    <MediaElement Height="131" HorizontalAlignment="Left" Margin="187,12,0,0" Name="mediaElement1" VerticalAlignment="Top" Width="165" />

    <Button Content="Play" Height="23" HorizontalAlignment="Left" Margin="372,12,0,0" Name="btnPlay" VerticalAlignment="Top" Width="75" Click="play" />

    <Button Content="Stop" Height="23" HorizontalAlignment="Left" Margin="372,42,0,0" Name="btnStop" VerticalAlignment="Top" Width="75" Click="stop" />

    <Button Content="Next" Height="23" HorizontalAlignment="Left" Margin="372,71,0,0" Name="btnNext" VerticalAlignment="Top" Width="75" Click="next" />

</Grid>

       

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Data;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Imaging;

using System.Windows.Navigation;

using System.Windows.Shapes;

 

 

namespace Modulated

{

/// <summary>

/// Interaction logic for MainWindow.xaml

/// </summary>

public partial class MainWindow : Window

{

    public MainWindow()

    {

        InitializeComponent();

    }

 

    private void play(object sender, RoutedEventArgs e)

    {

        mediaElement1.Play();

    }

 

    private void stop(object sender, RoutedEventArgs e)

    {

        mediaElement1.Stop();

    }

 

    private void next(object sender, RoutedEventArgs e)

    {}

 

    private void sort_asc(object sender, RoutedEventArgs e)

    {}

}

}