private void MessengerStatic_TaskItemWindowOpened(object obj)
        {
            TaskItemModel  selectedItem = (TaskItemModel)obj;
            TaskItemWindow taskItemWin  = new TaskItemWindow(selectedItem);

            taskItemWin.Show();
        }
        private void Button_Click(object sender, RoutedEventArgs e)
        {
            TaskItemWindow taskItemWin = new TaskItemWindow();

            taskItemWin.Show();
        }