After creating control dynamicly it does not allow click

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C#

ASP.NET

DevExpress

List<string> controlIdList = new List<string>();//to store control Id on each postback
int counter = 0;//count Number of Comboboxes
protected override void LoadViewState(Object savedstate)
{
base.LoadViewState(savedstate);
controlIdList = (List<string>)ViewState["controlIdList"];

foreach( string id in controlIdList)
{
counter++;
ASPxComboBox Cb = new ASPxComboBox();
Cb.ID = id;
Cb.DataSource = sdSku;
Cb.TextField = "SkU";
Cb.ValueField = "SkU";
Cb.ValueType = typeof(string);
Cb.Columns.Add("SKU");
Cb.Columns.Add("Model");
Cb.Columns.Add("Name");
Cb.Attributes.Add("runat", "server");
Cb.DataBind();
LiteralControl lineBreak = new LiteralControl("
");
PlaceholderSku.Controls.Add(Cb);
PlaceholderSku.Controls.Add(lineBreak);


}
}

protected void Page_Load(object sender, EventArgs e)
{

}
protected void btnAddSku_Click(object sender, EventArgs e)
{
counter++;
ASPxComboBox Cb = new ASPxComboBox();
Cb.ID = "SkuComboBox" + counter;


LiteralControl lineBreak = new LiteralControl("
");
PlaceholderSku.Controls.Add(Cb);
PlaceholderSku.Controls.Add(lineBreak);
controlIdList.Add(Cb.ID);
ViewState["controlIdList"] = controlIdList;//storing ids

}