Hello,

This is easy as well - just make sure you have something similar to this (the child collection needs to be a TList as well)

public class Docs
{
    public string Name { get; set; }
}

public class Budget
{
    public string BName { get; set; }
    public List<Docs> Dox { get; set; }
}

this.UltraWebGrid1.DisplayLayout.ViewType = Infragistics.WebUI.UltraWebGrid.ViewType.Hierarchical;
        List<Budget> list = new List<Budget>();

        Budget b1 = new Budget() { BName = "1999", Dox = new List<Docs>() };
        list.Add(b1);

        Budget b = new Budget() { BName = "2000", Dox = new List<Docs>() };
        Docs d = new Docs() { Name = "Bob" };
        b.Dox.Add(d);

        list.Add(b);
        this.UltraWebGrid1.DataSource = list;
        this.UltraWebGrid1.DataBind();

For more information, please take a look at the following forum thread:

http://forums.infragistics.com/forums/t/18040.aspx