Not able to fire Linkbutton click event added dynamically in asp.net?

Question

I have bound fields columns to gridview and added linkbutton at runtime.When i click to linkbutton Page load happen but Linkbutton event not invoked.
Below are my code sample.
 <asp:GridView ID="StoresGridView"    OnDataBound="StoresGridView_DataBound"
          Runat="server"         
          AutoGenerateColumns="False" DataKeyNames="Store"
          BorderWidth="1px" BackColor="LightGoldenrodYellow"
          GridLines="None" CellPadding="2" BorderColor="Tan"
          ForeColor="Black">
            <FooterStyle BackColor="Tan"></FooterStyle>
            <PagerStyle ForeColor="DarkSlateBlue"
              HorizontalAlign="Center" BackColor="PaleGoldenrod">
            </PagerStyle>
            <HeaderStyle Font-Bold="True"
              BackColor="Tan"></HeaderStyle>
            <AlternatingRowStyle
              BackColor="PaleGoldenrod"></AlternatingRowStyle>
            <Columns>
           
                <asp:BoundField HeaderText="Store"
                  InsertVisible="False" DataField="Store"
                    SortExpression="Store">
                    <ItemStyle HorizontalAlign="Center"></ItemStyle>
                </asp:BoundField> 
</Columns>
            <SelectedRowStyle ForeColor="GhostWhite"
                BackColor="DarkSlateBlue"></SelectedRowStyle>
        </asp:GridView> 
Below my Code-
 protected override void OnInit(EventArgs e)
        {
            base.OnInit(e);
            AddLinkButton();
        }
        protected void StoresGridView_DataBound(object sender, EventArgs e)
        {
            AddLinkButton();
        }
        /// <summary>
        /// Add a LinkButton To GridView Row.
        /// </summary> 
        private void AddLinkButton()
        {
            foreach (GridViewRow row in StoresGridView.Rows)
            {
                if (row.RowType == DataControlRowType.DataRow)
                {                  
                    LinkButton lb = new LinkButton();
                    lb.ID = "lnk";
                    lb.Text=row.Cells[0].Text;
                    lb.CommandName = "StoreDetail";
                    lb.Command += lnk_Command;
                    row.Cells[0].Controls.Add(lb);
                }
            }
        }
Here i am expecting linkbutton should invoked
     protected void lnk_Command(object sender, CommandEventArgs e)        {
            if (e.CommandName == "StoreDetail")
            {
                //This is to test 
                Response.Write("You Press Link Button!");
            }
        }
Is anyone Know about this ? or any suggestion on the same.