In aspx page,

<CuteWebUI:UploadAttachments InsertText="Upload Multiple files Now" runat="server" ID="Attachments1" OnPreRender="Attachments1_PreRender">
             </CuteWebUI:UploadAttachments>

In aspx.cs file,

 protected void Attachments1_PreRender(object sender, EventArgs e)
     {
         Attachments1.GetItemsTable().Visible = false;
        //Here you can bind the attachments with your grid
 
     }