public class GcCharMaskEditingControl : GrapeCity.Win.Editors.GcCharMask, GrapeCity.Win.MultiRow.IEditingControl  

using System;
using System.Windows.Forms;
using System.Drawing;
using GrapeCity.Win.Editors;

namespace GrapeCity.Win.MultiRow.InputMan.SampleCode
{
    class GcCharMaskCellEditingControlDemo : Form
    {
        private GcMultiRow gcMultiRow1 = new GcMultiRow();
        private Label label = new Label();

        public GcCharMaskCellEditingControlDemo()
        {
            this.Text = "GcCharMaskCellEditingControl Demo";
            this.Size = new Size(350, 300);

            // Add MultiRow to form
            this.gcMultiRow1.Dock = DockStyle.Fill;
            this.gcMultiRow1.EditingControlShowing += new EventHandler<EditingControlShowingEventArgs>(gcMultiRow1_EditingControlShowing);
            this.Controls.Add(this.gcMultiRow1);

            this.label.Dock = DockStyle.Bottom;
            this.label.Height = 30;
            this.label.BackColor = SystemColors.Info;
            this.label.Text = "Input some text in char box, the backcolor will change.";
            this.Controls.Add(label);

            this.Load += new EventHandler(Form1_Load);

            this.StartPosition = FormStartPosition.CenterScreen;
        }

        private void gcMultiRow1_EditingControlShowing(object sender, EditingControlShowingEventArgs e)
        {
            HighLightBox(e.Control, EventArgs.Empty);
            e.Control.TextChanged -= new EventHandler(HighLightBox);
            e.Control.TextChanged += new EventHandler(HighLightBox);
        }

        void HighLightBox(object sender, EventArgs e)
        {
            GcCharMask charMask = sender as GcCharMask;
            for (int i = 0; i < charMask.CharBoxes.Count; i++)
            {
                if (i < charMask.Text.Length)
                {
                    charMask.CharBoxes[i].BackColor = Color.Red;
                }
                else
                {
                    charMask.CharBoxes[i].BackColor = Color.Lime;
                }
            }
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            GcCharMaskCell gcCharMaskCell1 = new GcCharMaskCell();
            gcCharMaskCell1.Size = new Size(155, 40);
            Template template1 = Template.CreateGridTemplate(new Cell[] { gcCharMaskCell1 }, 160,
                AutoGenerateGridTemplateStyles.ColumnHeader | AutoGenerateGridTemplateStyles.RowHeaderAutoNumber);

            gcMultiRow1.Template = template1;
            gcMultiRow1.RowCount = 3;
        }

        [STAThreadAttribute()]
        public static void Main()
        {
            Application.EnableVisualStyles();
            Application.Run(new GcCharMaskCellEditingControlDemo());
        }
    }
}