protected override void CreateChildControls()
{
if(Controls.Count < 1 || Controls[0] != ComboTable) {
Controls.Clear();
ComboTableTextBoxCell.Controls.Add(TextBoxControl);
ComboTableButtonCell.Controls.Add(ButtonControl);
Controls.Add(ComboTable);
Controls.Add(OptionListControl);
Controls.Add(HiddenFieldControl);
}
}