public class GcTextBoxEditingControl : GrapeCity.Win.Editors.GcTextBox, GrapeCity.Win.MultiRow.IEditingControl  

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

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

        public GcTextBoxCellEditingControlDemo()
        {
            this.Text = "GcTextBoxCellEditingControl 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 = 50;
            this.label.BackColor = SystemColors.Info;
            this.label.Text = "In edit mode, open the editor's DropDown, input some text in DropDown, switch the focus from DropDown to other place, the value will be committed to editor; By default, you should hit ENTER key to commit value.";
            this.Controls.Add(label);

            this.Load += new EventHandler(Form1_Load);

            this.StartPosition = FormStartPosition.CenterScreen;
        }

        private void gcMultiRow1_EditingControlShowing(object sender, EditingControlShowingEventArgs e)
        {
            GcTextBox gcTextBox1 = e.Control as GcTextBox;
            gcTextBox1.DropDownClosing -= new EventHandler<DropDownClosingEventArgs>(gcTextBox1_DropDownClosing);
            gcTextBox1.DropDownClosing += new EventHandler<DropDownClosingEventArgs>(gcTextBox1_DropDownClosing);
        }

        void gcTextBox1_DropDownClosing(object sender, DropDownClosingEventArgs e)
        {
            //When the focus leave from the GcTextBox.DrowDown, the value will be committed to editor.
            e.SyncData = true;
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            GcTextBoxCell gcTextBoxCell1 = new GcTextBoxCell();
            Template template1 = Template.CreateGridTemplate(new Cell[] { gcTextBoxCell1 }, 160,
                AutoGenerateGridTemplateStyles.ColumnHeader | AutoGenerateGridTemplateStyles.RowHeaderAutoNumber);

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

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