Buttons disabled after file download

After downloading an excel with the grid data all my buttons on the page lose the functionality (search button to refresh the grid with other parameters and download a new excel with other data, eg dates).

I have tried to force him to refresh the page after downloading, both by server and by javascript, and he does not pay any attention to me (he is a rebel).

I have been told that it could be a devexpress bug ... Any ideas or alternatives?

ascx

<asp:Panel ID="DivContactosButtons" runat="server" CssClass="smc-gridButtons">
        <dx:ASPxButton ID="btnXlsExport" runat="server" Text="Export to XLS" OnClick="btnXlsExport_Click" CssClass="buttonsGrid">
        <ClientSideEvents Click="SMCContactosVisitasAspXGirdViewExportOnClick" />
    </dx:ASPxButton>
</asp:Panel>

<dx:ASPxGridViewExporter ID="gridExporter" runat="server"></dx:ASPxGridViewExporter>

ascx.cs

protected void btnXlsExport_Click(object sender, EventArgs e)
{
    using (MemoryStream stream = new MemoryStream())
    {
        this.gridExporter.WriteXls(stream);
        WriteToResponse(this.ExcelName, true, "xls", stream);
    }
}

protected void WriteToResponse(string fileName, bool saveAsFile, string fileFormat, System.IO.MemoryStream stream)
        {
            if (string.IsNullOrWhiteSpace(fileName))
            {
                fileName = "exportedGrid";
            }

            if (Page == null || Page.Response == null) return;
            string disposition = saveAsFile ? "attachment" : "inline";
            Page.Response.Clear();
            Page.Response.Buffer = false;
            Page.Response.AppendHeader("Content-Type", string.Format("application/{0}", fileFormat));
            Page.Response.AppendHeader("Content-Transfer-Encoding", "binary");
            Page.Response.AppendHeader("Content-Disposition", string.Format("{0}; filename={1}.{2}", disposition, HttpUtility.UrlEncode(fileName).Replace("+", "%20"), fileFormat));
            if (stream.Length > 0)
            {
                Page.Response.BinaryWrite(stream.ToArray());
            }
            //Page.Response.Redirect(Page.Request.Url.ToString(), true);
        }