ClsWin

private void HandleCloseRequest(ISubscribedMessageContext context)
{
    if (context.Message == null || string.IsNullOrWhiteSpace(context.Message.WinId))
    {
        return;
    }

    var hostedWindow = XperienceContext.Current.WindowManager.GetByWindowId(context.Message.WinId);

    if (hostedWindow != null)
    {
        if (this.ShouldAllowClose())
        {
            hostedWindow.Close();
        }
        else
        {
            hostedWindow.CancelClose();
        }
    }
}