public class GcTextBoxCell : InputManCellBase 

using System;
using System.Windows.Forms;
using System.Drawing;

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

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

            // Add MultiRow to form
            this.gcMultiRow1.Dock = DockStyle.Fill;
            this.Controls.Add(this.gcMultiRow1);

            this.label.Dock = DockStyle.Bottom;
            this.label.Height = 50;
            this.label.BackColor = SystemColors.Info;
            this.label.Text = " You can only input upper and lower case alphabet, as well as the symbols. Except '#', '@' and '*' chars; The DropDownButton will show when GcTextBoxCell is CurrentCell, and you can switch the DropDownList through hitting the F6 in edit mode.";
            this.Controls.Add(label);

            this.Load += new EventHandler(Form1_Load);

            this.StartPosition = FormStartPosition.CenterScreen;
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            // Create an instance of a GcTextBox control.
            GcTextBoxCell gcTextBoxCell1 = new GcTextBoxCell();
            // Accept upper and lower case alphabet, as well as the symbols. Except '#', '@' and '*' chars.
            gcTextBoxCell1.Format = @"aA@^\#\@*";
            // The GcTextBox will try to convert the invalid char to valid char automatically.
            gcTextBoxCell1.AutoConvert = true;

            DropDownButton dropDownButton1 = new DropDownButton();
            dropDownButton1.Visible = CellButtonVisibility.ShowForCurrentCell;
            gcTextBoxCell1.SideButtons.Add(dropDownButton1);

            //Hit the "F6" to switch the DropDownList.
            gcTextBoxCell1.ShortcutKeys.Add(Keys.F6, "SwitchDropDown");

            Template template1 = Template.CreateGridTemplate(new Cell[] { gcTextBoxCell1, gcTextBoxCell1.Clone() as Cell }, 160,
                AutoGenerateGridTemplateStyles.ColumnHeader | AutoGenerateGridTemplateStyles.RowHeaderAutoNumber);

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

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