MainWindow.xaml

<Window x:Class="WPFMediaTest.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:WPFMediaTest"
        mc:Ignorable="d"
        Title="MainWindow" WindowState="Maximized">
    <Grid>
        <local:MediaControl x:Name="MediaControl"/>
        <Button Content="Button2" Margin="139,0,0,236" VerticalAlignment="Bottom" HorizontalAlignment="Left" Width="75" Click="Button_Click_1"/>
        <Button Content="Button1" Margin="317,192,368,293" Click="Button_Click" VerticalAlignment="Bottom" HorizontalAlignment="Left" Width="75"/>
        <Button Content="Button3" Margin="0,0,410,236" Height="19" VerticalAlignment="Bottom" HorizontalAlignment="Right" Width="75" Click="Button_Click_2"/>
    </Grid>

</Window>