Onitemcommand event was may / maynot firing during execution

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ASP.NET

Ajax

Hi Iam able to create the ajax accordian control.In contentTemplate I had created the Button with the name of "Fill" and added the event onitemcommand ,

Iam facing the problem with the event.it was firing sometimes and it was not firing sometime, please Help me

I had created the Accordian Control with the dynamic button control

<asp:Accordion ID="Accordion1" runat="server" ContentCssClass="accordionContent"
    FadeTransitions="true" FramesPerSecond="250" HeaderCssClass="accordionHeader"
    HeaderSelectedCssClass="accordionHeaderSelected" OnItemCommand="Accordion1_ItemCommand"
    TransitionDuration="50" EnableTheming="True" RequireOpenedPane="False" SuppressHeaderPostbacks="True">
    <HeaderTemplate runat="server">
      </HeaderTemplate>
    <ContentTemplate  runat="server">
        <table width="100%">

            <tr>
                <td>
                </td>
                <td>
                    <asp:Button ID="Button3" runat="server" CommandName="Scrap" Text="Scrap" />
                </td>
                <td>
                    <asp:Button ID="Button4" runat="server" CommandName="fill" Text="Fill" />
                </td>
            </tr>
        </table>
    </ContentTemplate>
</asp:Accordion>

I am firing the event

as

  protected void Accordion1_ItemCommand(object sender, CommandEventArgs e)
    {
  if (e.CommandName == "fill")
            {
//  some   code
}

}

This event may or maynot fire,
ex: for one time it fires
another time may or maynot fires
......

just like that

In page load code is

    if (!IsPostBack)
    {
        pageno = 0;
         PagedDataSource pg = new PagedDataSource();
pg.AllowPaging = true;
pg.PageSize = 10;
pg.CurrentPageIndex = pageno;
LinkButton1.Visible = true;
LinkButton2.Visible = true;
con = new MySqlConnection(ConfigurationManager.ConnectionStrings["tablename"].ConnectionString);
MySqlCommand cmd = new MySqlCommand("some  query", con);
MySqlDataAdapter da = new MySqlDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds, "invoicereview");
pg.DataSource = ds.Tables["tablename"].DefaultView;
LinkButton1.Enabled = !pg.IsFirstPage;
LinkButton2.Enabled = !pg.IsLastPage;
Accordion1.DataSource = pg;
Accordion1.DataBind();
    }

Here i am also using the paging

so please specify me where excately it was going wrong