WPF specific view presenter class supporting closing an MVVMCross based application

MvxCloseableWpfViewPresenter.cs

public class MvxCloseableWpfViewPresenter : MvxWpfViewPresenter
{
	#region FIELDS

	private readonly Window _window;
	
	#endregion

	#region CONSTRUCTORS

	public MvxCloseableWpfViewPresenter(Window window)
	{
		if (window == null) throw new ArgumentNullException("window");
		_window = window;
	}

	#endregion

	#region METHODS

	public override void Present(FrameworkElement frameworkElement)
	{
		_window.Content = frameworkElement;
	}

	public override void ChangePresentation(MvxPresentationHint hint)
	{
		IMvxWpfView view;
		var closeHint = hint as MvxClosePresentationHint;
		if (closeHint != null && (view = _window.Content as IMvxWpfView) != null &&
		    ReferenceEquals(closeHint.ViewModelToClose, view.ViewModel))
			_window.Close();

		base.ChangePresentation(hint);
	}

	#endregion
}

Hi Sir.
I used your code. Now I can show sub window and close it.But there is a little different in ChangePresentation method.Maybe it's not good.I hope can get your guide.
Thanks.
public class MvxWindowViewPresenter : MvxWpfViewPresenter
{
private readonly ContentControl _contentControl;

    private FrameworkElement _frameworkElement;
    public MvxWindowViewPresenter(ContentControl contentControl)
    {
        _contentControl = contentControl;
    }

    public override void Present(FrameworkElement frameworkElement)
    {
        _frameworkElement = frameworkElement;
        var window = frameworkElement as Window;
        if (window == null)
        {
            _contentControl.Content = frameworkElement;
        }
        else
        {
            window.Owner = _contentControl as Window;
            window.ShowDialog();
        }
    }

    public override void ChangePresentation(MvxPresentationHint hint)
    {
        IMvxWpfView view;
        var closeHint = hint as MvxClosePresentationHint;
        if (closeHint != null
            && (view = _frameworkElement as IMvxWpfView) != null
            && ReferenceEquals(closeHint.ViewModelToClose, view.ViewModel))
        {
            (_frameworkElement as Window).Close();
        }

        base.ChangePresentation(hint);
    }
}