xaml for progress bar and controls in a Taskbar definition for a WPF application in Windows 7.

taskbar.xaml

<Window.TaskbarItemInfo>
  <TaskbarItemInfo Description="My Taskbar Sample" ProgressState="Normal">
    <TaskbarItemInfo.ProgressValue>
      <MultiBinding Converter="{StaticResource ProgressBarConverter}">
        <Binding Path="SongsUsed" Mode="OneWay" Converter="{StaticResource ListToCountConverter}"/>
        <Binding Path="NumberOfSongs"/>
      </MultiBinding>
    </TaskbarItemInfo.ProgressValue>
    <TaskbarItemInfo.ThumbButtonInfos>
      <ThumbButtonInfoCollection>
        <ThumbButtonInfo  x:Name="_ThumbnailBackButton"
                          Description="Previous"
                          ImageSource="Resources\Backward.ico"
                          Command="{Binding Backtrack}"/>
        <ThumbButtonInfo  x:Name="_ThumbnailPauseButton"
                          ImageSource="{Binding Path=PlayState, Converter={StaticResource BooleanToPlayStateIconConverter}}"
                          DismissWhenClicked="False"
                          Command="{Binding PlayPause}"/>
        <ThumbButtonInfo  x:Name="_ThumbnailForwardButton"
                          Description="Next"
                          ImageSource="Resources\Forward.ico"
                          Command="{Binding ForwardTrack}"/>
      </ThumbButtonInfoCollection>
    </TaskbarItemInfo.ThumbButtonInfos>
  </TaskbarItemInfo>
</Window.TaskbarItemInfo>