private void mainWindow_Loaded(object sender, RoutedEventArgs e)
        {
            PTManager manager = (PTManager)this.DataContext;

            manager.SetObserver(this);
            dateView.ItemsSource = manager.GetDateTable().DefaultView;
        }
        public void update()
        {
            PTManager manager = (PTManager)this.DataContext;

            dateView.ItemsSource = manager.GetDateTable().DefaultView;
            if (dateView.SelectedItem != null)
            {
                DateTime datetime = (DateTime)((DataRowView)dateView.SelectedItem).Row.ItemArray[0];
                processInfoView.ItemsSource = manager.GetProcessInfoTableForDate(datetime).DefaultView;
            }
        }