将新项目从其他窗口添加到列表框中

在我的wpf应用程序中，我创建了两个视图类，DayView和CustomView。在DayView中，有一个由一些条目组成的列表框。在列表框中，有一个包含5个文本框的堆叠面板。在我的CustomView类中，我还创建了带有5个文本框的stackpanel。当我在CustomView的文本框中输入数据并单击保存按钮时，新条目应该创建，数据应该保存在DayView的相应文本框中。

CustomView类：

namespace TimeSheet
{
/// <summary>
/// Interaction logic for CustomView.xaml
/// </summary>
public partial class CustomView : Window
{
    public List<Harvest_Project> projectList { get; set; }
    public List<Harvest_Client> clientList { get; set; }
    public Harvest_Project selectedProjectid { get; set; }
    public Harvest_Client selectedClientid { get; set; }
    private string client { get { return ClientText.Text; } set { ClientText.Text=value;} }
    private string application { get { return ApplicationText.Text; } set { ApplicationText.Text = value; } }
    private string starttime { get { return StartTimeText.Text; } set { StartTimeText.Text = value; } }
    private string stoptime { get { return StopTimeText.Text; } set { StopTimeText.Text = value; } }
    private string task { get { return TaskText.Text; } set { TaskText.Text = value; } }
    private string project { get { return ProjectText.Text; } set { ProjectText.Text = value; } }
    public CustomView()
    {
        InitializeComponent();
        this.DataContext = this;
        Globals._globalController.setCustomViewWindow(this);
        clientList = Globals._globalController.harvestManager._CLIENTLIST;
        projectList = Globals._globalController.harvestManager._PROJECTLIST;
    }
    private void SaveButton_Click(object sender, RoutedEventArgs e)
    {
        if (sender is Harvest_TimeSheetEntry)
        {
            //Harvest_TimeSheetEntry entry = new Harvest_TimeSheetEntry();
            //if (!entry.isSynced)
            //{
            //    entry.ClientNameBinding = client;
            //    entry.ApplicationNameBinding = application;
            //    entry.StartTimeBinding = starttime;
            //    entry.StopTimeBinding = stoptime;
            //    entry.TaskNameBinding = task;
            //    entry.ProjectNameBinding = project;
            //}
            Globals._globalController.getDayViewWindow.Show();
            this.Hide();
        }
   }
    private void ClientComboBoxChanged(object sender, SelectionChangedEventArgs e)
    {
        string text = (sender as ComboBox).SelectedItem.ToString();
    }
    private void ProjectComboBoxChanged(object sender, SelectionChangedEventArgs e)
    {
        string text = (sender as ComboBox).SelectedItem.ToString();
    }
}
}

我不明白，我应该如何在DayView列表框中保存这些数据。请提出一些方法。！

这是DayView窗口

[1]: https://i.stack.imgur.com/1Qi0e.png

这是CustomView窗口！

[2]: https://i.stack.imgur.com/mACxR.png