Hello,

I would like to add check boxes column to my grid. The list that I pull for the database does not contain boolean column, I would like to add it on the fly. Here is the code from my testing project where I am trying to achieve this:

using Infragistics.Win.UltraWinGrid;
using System;
using System.Collections.Generic;
using System.Windows.Forms;

namespace UITests
{
    public partial class Form1 : Form
    {
        const string IsChecked = "IsChecked";
        public Form1()
        {
            InitializeComponent();
        }

        protected override void OnLoad(EventArgs e)
        {
            base.OnLoad(e);

            var isChecked = ultraGrid1.DisplayLayout.Bands[0]
                .Columns.Add(IsChecked, string.Empty);

            isChecked.Style = Infragistics.Win.UltraWinGrid.ColumnStyle.CheckBox;
            isChecked.Header.CheckBoxVisibility = HeaderCheckBoxVisibility.Always;
            isChecked.DefaultCellValue = Infragistics.Win.DefaultableBoolean.False;

            ultraGrid1.DataSource = Data;
        }

        private List<TestItem> Data
        {
            get
            {
                var data = new List<TestItem>();
                for (var i = 0; i < 3; ++i)
                {
                    data.Add(new TestItem()
                    {
                        ID = i.ToString(),
                        Name = "name" + i,
                        Description = "description" + i
                    });
                }

                return data;
            }
        }
    }

    public class TestItem
    {
        public string ID { get; set; }
        public string Name { get; set; }
        public string Description { get; set; }
    }
}

I want all row and header checkboxes to be unchecked by default, but they are in an indeterminate state: