I am receiving an error while binding my grid to an object from a click event off a button.  My Grid has 3 columns Price, Qty and Total.  Price and Qty are bound to the Price and Qty field in my class and total is a formula of Price * Qty.  The bands basetablename is bound to clsList set up in createBind().  If I remove the WebCalcManager, or change my object to a datatable everything works fine.
Here a quick example that shows the issue.

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        LinkButton linkButton = new LinkButton();
        linkButton.ID = "TestButton";
        linkButton.Text = "Push Me";
        linkButton.Click += new EventHandler(LinkButton_Clicked);
        testDiv.Controls.Add(linkButton);
    }
    protected void LinkButton_Clicked(object sender, EventArgs e)
    {
        createBind();
    }
    private void createBind()
    {
        Class1 cls;
        System.Collections.Generic.List<Class1> clsList = new System.Collections.Generic.List<Class1>();
        for (int i = 1; i <= 5; i++)
        {
            cls = new Class1();
            cls.Price = i * 50;
            cls.Qty = i * 2;
            clsList.Add(cls);
        }
        this.UltraWebGrid1.DataSource = clsList;
        this.UltraWebGrid1.DataBind();
    }
}

public class Class1
{
    public int Price { get; set; }
    public int Qty { get; set; }
}

 Here is the stack trace I receive.

NullReferenceException: Object reference not set to an instance of an object.]
   Infragistics.WebUI.UltraWebGrid.UltraCalc.RefCellCollectionEnumerator.MoveNext() +44
   Infragistics.WebUI.CalcEngine.RangeCalcInfo.EvaluateNextRow() +63
   Infragistics.WebUI.CalcEngine.UltraCalcEngine.Evaluate(Int64 ticks) +181
   Infragistics.WebUI.CalcEngine.UltraCalcEngine.Recalc(Int64 ticks) +215
   Infragistics.WebUI.UltraWebCalcManager.UltraWebCalcManager.ReCalcInternal(Int64 ticks, Boolean ignoreSuspend) +197
   Infragistics.WebUI.UltraWebCalcManager.UltraWebCalcManager.ReCalc(Int64 millis) +382
   Infragistics.WebUI.UltraWebCalcManager.UltraWebCalcManager.ReCalc(Boolean ignoreSuspend) +33
   Infragistics.WebUI.UltraWebCalcManager.UltraWebCalcManager.ReCalc() +33
   Infragistics.WebUI.UltraWebCalcManager.UltraWebCalcManager.ReCalcSynchronous() +54
   Infragistics.WebUI.UltraWebCalcManager.UltraWebCalcManager.VerifyReCalc() +54
   Infragistics.WebUI.UltraWebCalcManager.UltraWebCalcManager.DirtyCalc(IUltraCalcReference reference, ValueDirtiedAction action) +98
   Infragistics.WebUI.UltraWebCalcManager.UltraWebCalcManager.Infragistics.WebUI.CalcEngine.IUltraCalcManager.AddReference(IUltraCalcReference reference) +104
   Infragistics.WebUI.UltraWebGrid.UltraWebGrid.RegisterWithCalcManager() +187
   Infragistics.WebUI.UltraWebGrid.UltraGridLayout.ResumeCalcManagerNotifications() +234
   Infragistics.WebUI.UltraWebGrid.DBBinding.BindList(IEnumerable datasource) +3461
   Infragistics.WebUI.UltraWebGrid.DBBinding.DataBind(Object dataSource, String dataMember) +1926
   Infragistics.WebUI.UltraWebGrid.UltraWebGrid.DataBind() +1244
   GridTest._Default.createBind() in C:\Users\tlange\Documents\Visual Studio 2008\Projects\GridTest\Default.aspx.cs:47
   GridTest._Default.LinkButton_Clicked(Object sender, EventArgs e) in C:\Users\tlange\Documents\Visual Studio 2008\Projects\GridTest\Default.aspx.cs:30
   System.Web.UI.WebControls.LinkButton.OnClick(EventArgs e) +90
   System.Web.UI.WebControls.LinkButton.RaisePostBackEvent(String eventArgument) +76
   System.Web.UI.WebControls.LinkButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +7
   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +11
   System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +177
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

Does anybody have a fix for this issue?