Basic WPF control to contain a SWF Flash object

WpfFlashControl.xaml.cs

public partial class WpfFlashControl
{
    /// <summary>
    /// Allows an WPF ui element to embed a WinForms element.
    /// </summary>
    private WindowsFormsHost _host;

    /// <summary>
    /// The WinForms flash control.
    /// </summary>
    private WinFormsFlashControl _player;

    /// <summary>
    /// Gets or sets the path to the .swf file.
    /// </summary>
    public Uri Source
    {
        [System.Diagnostics.DebuggerStepThrough]
        get { return _player.Source; }
        set
        {
            //
            // Reset visibilities
            //
            _host.Visibility = Visibility.Visible;
            txt_error.Visibility = Visibility.Collapsed;

            //
            // Get the path to the file
            //
            string path = Path.GetFullPath(value.LocalPath);

            //
            // Check and load
            //
            if (!string.IsNullOrEmpty(path) && !File.Exists(path))
            {
                //
                // Show errors
                //
                txt_error.Text = string.Format("File not found:\r\n{0}", path);
                txt_error.Visibility = Visibility.Visible;
                _host.Visibility = Visibility.Collapsed;
            } else {
                //
                // No errors, load file.
                //
                _player.Source = value;
            }
        }
    }     

    public WpfFlashControl()
    {
        InitializeComponent();

        //
        // Hooke the SizeChanged event to resize the inner control.
        //
        SizeChanged += WpfFlashControlSizeChanged;

        //
        // Hook the Loaded event to initialize on load, not on
        // instantiation.
        //
        Loaded += WpfFlashControlLoaded;
    }

    private void WpfFlashControlSizeChanged(object sender, SizeChangedEventArgs e)
    {
        //
        // Check
        //
        if (_player == null)
            return;

        //
        // Assign size.
        //
        _player.Width = double.IsNaN(Width) ? (int)ActualWidth : (int)Width;
        _player.Height = double.IsNaN(Height) ? (int)ActualHeight : (int)Height;
    }

    private void WpfFlashControlLoaded(object sender, RoutedEventArgs e)
    {
        //
        // Create the proxy window to win forms
        //
        _host = new WindowsFormsHost();
        //
        // Create the winforms control.
        //
        _player = new WinFormsFlashControl();
        //
        // Add the winforms control into the proxy.
        //
        _host.Child = _player;
        //
        // Add the winforms proxy to the grid.
        //
        grid_flash.Children.Add(_host);
    }

    /// <summary>
    /// Starts or resumes the file.
    /// </summary>
    public void Play()
    {
        _player.Play();
    }

    /// <summary>
    /// Pauses the file.
    /// </summary>
    public void Pause()
    {
        _player.Pause();
    }

    /// <summary>
    /// Stops the file.
    /// </summary>
    public void Stop()
    {
        _player.Stop();
    } 

}