Add datasource and databinding properties to an asp.net custom control

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C#

ASP.NET

custom-controls

I am trying to create a custom control with multi select option. what i want is a dropdownlist whose contents all have text boxes to enable multiple selection. what i have done till now is i used a text box and image button to show as dropdownlist. And on clicking it, a panel will be opened below that will contain a checkbox list. i want to know how i can bind data to this custom control so that it will populate the checkbox list

[ToolboxData("<{0}:CustomDropdown  runat="server"></{0}:CustomDropdown>")]
   public class CustomDropdown : CompositeControl
   {
       TextBox textBox;
       ImageButton button;
       CheckBoxList checkBox;
       Panel pnlForChkBox;
       HtmlGenericControl div = new HtmlGenericControl("div");

       protected override void CreateChildControls()
       {
           Controls.Clear();

           textBox = new TextBox();
           textBox.ID = "txtbox";

           button = new ImageButton();
           button.ID = "btn";
           button.ImageUrl = "~/images/CustomDropdown.png";
           button.ImageAlign = ImageAlign.Middle;
           button.Click += new ImageClickEventHandler(button_Click);
           button.Height = Unit.Pixel(22);

           checkBox = new CheckBoxList();
           checkBox.ID = "chkList";


           pnlForChkBox = new Panel();
           pnlForChkBox.ID = "pnlForChkbox";
           pnlForChkBox.Controls.Add(checkBox);
           pnlForChkBox.Style.Add("border", "black 1px solid");
           pnlForChkBox.Style.Add("overflow-y", "scroll");
           pnlForChkBox.Style.Add("overflow-x", "x:hidden");
           pnlForChkBox.Style.Add("width", "180px");
           pnlForChkBox.Style.Add("Height", "180px");
           pnlForChkBox.Visible = false;
           this.Controls.Add(textBox);
           this.Controls.Add(button);
           this.Controls.Add(pnlForChkBox);

       }