Програми для обліку

using Gtk;

class Program
{
    public static void Main()
    {
        Application.Init();
        new FirstWindow();
        Application.Run();
    }

    public static void Quit()
    {
        Application.Quit();
    }
}

using Gtk;

class FirstWindow : Window
{
    public FirstWindow() : base("Test")
    {
        SetDefaultSize(600, 350);
        SetPosition(WindowPosition.Center);

        DeleteEvent += delegate { Program.Quit(); };

        VBox vBox = new VBox();
        Add(vBox);

        HBox hBox = new HBox();
        vBox.PackStart(hBox, true, true, 5);

        ScrolledWindow scroll = new ScrolledWindow();
        scroll.SetPolicy(PolicyType.Automatic, PolicyType.Automatic);
        hBox.PackStart(scroll, true, true, 5);

        FlowBox flowBox = new FlowBox
        {
            Orientation = Orientation.Horizontal,
            Valign = Align.Start,
            MinChildrenPerLine = 2,
            MaxChildrenPerLine = 5,
            SelectionMode = SelectionMode.None
        };

        for (int i = 0; i < 23; i++)
            flowBox.Add(new Button($"{i}"));

        scroll.Add(flowBox);

        ShowAll();
    }
}