Devexpress aspxgridview export excel (update panel)

protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
ScriptManager sm = ScriptManager.GetCurrent(this.Page);
sm.RegisterPostBackControl(this.ASPxButtonExport);
}
}



<dx:ASPxButton ID="ASPxButtonExport" runat="server" Text="->Xls" OnClick="ASPxButtonExport_Click" Theme="Default" Visible="true" AutoPostBack="False">
<Image IconID="export_exporttoxls_32x32">
</Image>
</dx:ASPxButton>
<dx:ASPxGridViewExporter ID="ASPxGridExporter1" runat="server" GridViewID="ASPxGridView1"></dx:ASPxGridViewExporter>