Yes loadondemand has been implemented.

But again, we have here a big performance issue on Firefox, but on IE : is just unacceptable. 

I have ask my IT that without a 30 day money back warranty, to not buy any licence for this product....

See our code:

using System;
using System.Collections;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

using Tech2020.w2020net.Model;
using Tech2020.w2020net.BusinessLogicLayer;
using System.Drawing;

public partial class Admin_User_list : System.Web.UI.Page
{
    private static Tech2020.w2020net.BusinessLogicLayer.User bal = new Tech2020.w2020net.BusinessLogicLayer.User();

    private void Page_Init(object sender, System.EventArgs e)
    {
        this.EnableViewState = false;
    }

    protected void Page_Load(object sender, EventArgs e)
    {
        this.UltraWebGrid1.InitializeLayout += new Infragistics.WebUI.UltraWebGrid.InitializeLayoutEventHandler(this.UltraWebGrid1_InitializeLayout);
        this.UltraWebGrid1.InitializeRow += new Infragistics.WebUI.UltraWebGrid.InitializeRowEventHandler(UltraWebGrid1_InitializeRow);

        UltraWebGrid1.DisplayLayout.LoadOnDemand = Infragistics.WebUI.UltraWebGrid.LoadOnDemand.Automatic;
       
        IList<Tech2020.w2020net.Model.User> users;
      
        users = bal.GetUsers(-1); // status 0 == active And 1 == deleted in the ektron system

       UltraWebGrid1.DataSource = users;
        UltraWebGrid1.DataBind();
    }

    void UltraWebGrid1_InitializeRow(object sender, Infragistics.WebUI.UltraWebGrid.RowEventArgs e)
    {
        e.Row.Cells[0].Text = "<a href=\"Edit.aspx?userID=" + e.Row.Cells[1].Text + "&TB_iframe=true&height=500&width=650&modal=true\" class=\"thickbox\">Edit</a>";
    }

    private void UltraWebGrid1_InitializeLayout(object sender, Infragistics.WebUI.UltraWebGrid.LayoutEventArgs e)
    {
        /*UltraWebGrid1.DisplayLayout.Bands[0].Columns[0].Header.Caption                  = "";
        UltraWebGrid1.DisplayLayout.Bands[0].Columns[1].Header.Caption                  = "ID";
        UltraWebGrid1.DisplayLayout.Bands[0].Columns[2].Header.Caption                  = "First name";
        UltraWebGrid1.DisplayLayout.Bands[0].Columns[3].Header.Caption                  = "Last name";
        UltraWebGrid1.DisplayLayout.Bands[0].Columns[4].Header.Caption                  = "Email";
        UltraWebGrid1.DisplayLayout.Bands[0].Columns[5].Header.Caption                  = "Member";
        UltraWebGrid1.DisplayLayout.Bands[0].Columns[6].Header.Caption                  = "Active";
        UltraWebGrid1.DisplayLayout.Bands[0].Columns[7].Header.Caption                  = "Last login";
        UltraWebGrid1.DisplayLayout.Bands[0].Columns[8].Header.Caption                  = "Edited on";
        */
        UltraWebGrid1.Columns[0].CellStyle.HorizontalAlign                              = HorizontalAlign.Center;
        UltraWebGrid1.Columns[0].CellStyle.VerticalAlign                                = VerticalAlign.Middle;
        UltraWebGrid1.Columns[8].CellStyle.HorizontalAlign                              = HorizontalAlign.Center;
        UltraWebGrid1.Columns[8].CellStyle.VerticalAlign                                = VerticalAlign.Middle;
        UltraWebGrid1.Columns[9].CellStyle.HorizontalAlign                              = HorizontalAlign.Center;
        UltraWebGrid1.Columns[9].CellStyle.VerticalAlign                                = VerticalAlign.Middle;

        UltraWebGrid1.DisplayLayout.Bands[0].Columns[8].Header.Style.HorizontalAlign    = HorizontalAlign.Center;
        UltraWebGrid1.DisplayLayout.Bands[0].Columns[9].Header.Style.HorizontalAlign    = HorizontalAlign.Center;

        UltraWebGrid1.Columns[0].Width                                                  = 75;
        
    }

    protected void CreateColumn(DataTable dt, string type, string name)
    {
        DataColumn dc;

        dc = new DataColumn();
        dc.DataType = Type.GetType(type);
        dc.ColumnName = name;
        dt.Columns.Add(dc);
    }
}

Do you have loadondemand on the demo link above? because it isn't doing loadondemand much better file size now though