Hello currently I am getting the following error:

Microsoft JScript runtime error: Unable to get value of the property 'valueOf': object is null or undefined

This is happening in the following dynamic javascript function:

isDataKeyEqual: function (dataKey)

            {

                        ///<summary locid="M:J#Infragistics.Web.UI.GridRow.isDataKeyEqual">

                        ///Compares provided data key with the row's data key and returns a

                        ///boolean value indicating whether these are equal.

                        ///</summary>

                        ///<param name="dataKey" type="Array">

                        ///A data key to compare with the row's one.

                        ///</param>

                        ///<returns type="Boolean">

                        ///Boolean value indicating whether the passed in data key is equal to the row's one.

                        ///</returns>

                        var rowDataKey = this.get_dataKey();

                        if (rowDataKey && dataKey && rowDataKey.length == dataKey.length)

                        {

                                    for (var i = 0; i < dataKey.length; i++)

                                    {

                                                /* DAY 8/23/11 84816- Row cannot be found on client with compound key that contains Date */

                                                if (rowDataKey[i].valueOf && dataKey[i].valueOf && rowDataKey[i].valueOf() != dataKey[i].valueOf())

                                                            return false;

                                                else if ((!rowDataKey[i].valueOf || !dataKey[i].valueOf) && rowDataKey[i] != dataKey[i])

                                                            return false;

                                    }

                                    return true;

                        }

                        return false;

            },

Here's how I have my grid configured:

<ig:WebDataGrid ID="wdgSPSearch" runat="server" AutoGenerateColumns="False" Width="100%" EnableDataViewState="True" EnableViewState="True"

                            OnDataBound="wdgSPSearch_DataBound" OnInitializeRow="wdgSPSearch_InitializeRow"

                            OnItemCommand="wdgSPSearch_ItemCommand">

                            <Columns>

                                <ig:TemplateDataField Key="SELECT" Width="40px">

                                    <ItemTemplate>

                                        <input type="checkbox" id="SelectCheckBox" class="ServiceProviderSelection" runat="server"/>

                                    </ItemTemplate>

                                </ig:TemplateDataField>

                                <ig:UnboundField Key="SUPERVISOR" Header-Text="Supervisor" Width="100px">

                                    <Header Text="Supervisor" />

                                </ig:UnboundField>

                                <ig:UnboundField Key="CRAFT_GROUPS" Header-Text="Craft Group(s)" Width="130px">

                                    <Header Text="Craft Group(s)" />

                                </ig:UnboundField>

                                <ig:BoundDataField DataFieldName="STATUS_NAME" Key="STATUS_NAME" Width="60px">

                                    <Header Text="Status" />

                                </ig:BoundDataField>

                                <ig:UnboundField Key="SP_NUM_NAME" Width="200px" HtmlEncode="false">

                                    <Header Text="Service Provider" />

                                </ig:UnboundField>

                                <ig:BoundDataField DataFieldName="AB_NUMBER" Key="AB_NUMBER" Hidden="true">

                                    <Header Text="AB_NUMBER" />

                                </ig:BoundDataField>

                                <ig:UnboundField Key="CURRENT_DAY" Width="55px">

                                    <Header TemplateId="currDayDateHeaderTemplate" />

                                </ig:UnboundField>

                                <ig:UnboundField Key="TOMMORROW" Width="55px">

                                    <Header TemplateId="secondDayDateHeaderTemplate" />

                                </ig:UnboundField>

                                <ig:UnboundField Key="TOMMORROW_PLUS_ONE" Width="55px">

                                    <Header TemplateId="thirdDayDateHeaderTemplate" />

                                </ig:UnboundField>

                                <ig:UnboundField Key="TOMMORROW_PLUS_TWO" Width="55px">

                                    <Header TemplateId="fourthDayDateHeaderTemplate" />

                                </ig:UnboundField>

                                <ig:UnboundField Key="TOMMORROW_PLUS_THREE" Width="55px">

                                    <Header TemplateId="fifthDayDateHeaderTemplate" />

                                </ig:UnboundField>

                                <ig:UnboundField Key="TOMMORROW_PLUS_FOUR" Width="55px">

                                    <Header TemplateId="sixthDayDateHeaderTemplate" />

                                </ig:UnboundField>

                                <ig:UnboundField Key="TOMMORROW_PLUS_FIVE" Width="55px">

                                    <Header TemplateId="seventhDayDateHeaderTemplate"></Header>

                                </ig:UnboundField>

                                <ig:UnboundField Key="PERCENT_ALLOCATED" Header-Text="% Allocated" Width="90px">

                                    <Header Text="% Allocated" />

                                </ig:UnboundField>

                                <ig:TemplateDataField Key="ASSIGNMENTS" Width="90px">

                                    <Header Text="Assignments" />

                                    <ItemTemplate>

                                        <asp:LinkButton runat="server" ID="lbtnAssignments" CssClass="LoadingItem" CommandName="SELECT_ASSIGNMENTS"

                                            CommandArgument='<%# Eval("AB_NUMBER") %>'>Assignments</asp:LinkButton>

                                    </ItemTemplate>

                                </ig:TemplateDataField>

                                <ig:TemplateDataField Key="SCHEDULE" Width="90px">

                                    <Header Text="Schedule" />

                                    <ItemTemplate>

                                        <asp:LinkButton runat="server" ID="lbtnSchedule" CommandName="SELECT_SCHEDULE" CssClass="LoadingItem" CommandArgument='<%# Eval("AB_NUMBER") %>'>Schedule</asp:LinkButton>

                                    </ItemTemplate>

                                </ig:TemplateDataField>

                            </Columns>

                            <Templates>

                                <cc1:ItemTemplate ID="dteTemplate" runat="server" TemplateID="currDayDateHeaderTemplate">

                                    <Template>

                                        <asp:LinkButton runat="server" CssClass="AssignmentButton" ID="lbtnCurrentDay" CommandName="ASSIGN_CURRENT"><%= currDay.ToShortDateString() %></asp:LinkButton>

                                    </Template>

                                </cc1:ItemTemplate>

                                <cc1:ItemTemplate ID="dteTemplate2" runat="server" TemplateID="secondDayDateHeaderTemplate">

                                    <Template>

                                        <asp:LinkButton runat="server" CssClass="AssignmentButton" ID="lbtnSecondDay" PostBackUrl="../ApplicationForms/ManagerInterface/WOScheduler.aspx"

                                            CommandName="ASSIGN_TOMORROW"><%= currDay.AddDays(1).ToShortDateString() %></asp:LinkButton>

                                    </Template>

                                </cc1:ItemTemplate>

                                <cc1:ItemTemplate ID="dteTemplate3" runat="server" TemplateID="thirdDayDateHeaderTemplate">

                                    <Template>

                                        <asp:LinkButton runat="server" CssClass="AssignmentButton" ID="lbtnThirdDay" PostBackUrl="../ApplicationForms/ManagerInterface/WOScheduler.aspx"

                                            CommandName="ASSIGN_THIRD_DAY"><%= currDay.AddDays(2).ToShortDateString() %></asp:LinkButton>

                                    </Template>

                                </cc1:ItemTemplate>

                                <cc1:ItemTemplate ID="dteTemplate4" runat="server" TemplateID="fourthDayDateHeaderTemplate">

                                    <Template>

                                        <asp:LinkButton runat="server" CssClass="AssignmentButton" ID="lbtnFourthDay" PostBackUrl="../ApplicationForms/ManagerInterface/WOScheduler.aspx"

                                            CommandName="ASSIGN_FOURTH_DAY"><%= currDay.AddDays(3).ToShortDateString() %></asp:LinkButton>

                                    </Template>

                                </cc1:ItemTemplate>

                                <cc1:ItemTemplate ID="dteTemplate5" runat="server" TemplateID="fifthDayDateHeaderTemplate">

                                    <Template>

                                        <asp:LinkButton runat="server" CssClass="AssignmentButton" ID="lbtnFifthDay" PostBackUrl="../ApplicationForms/ManagerInterface/WOScheduler.aspx"

                                            CommandName="ASSIGN_FIFTH_DAY"><%= currDay.AddDays(4).ToShortDateString() %></asp:LinkButton>

                                    </Template>

                                </cc1:ItemTemplate>

                                <cc1:ItemTemplate ID="dteTemplate6" runat="server" TemplateID="sixthDayDateHeaderTemplate">

                                    <Template>

                                        <asp:LinkButton runat="server" CssClass="AssignmentButton" ID="lbtnSixthDay" PostBackUrl="../ApplicationForms/ManagerInterface/WOScheduler.aspx"

                                            CommandName="ASSIGN_SIXTH_DAY"><%= currDay.AddDays(5).ToShortDateString() %></asp:LinkButton>

                                    </Template>

                                </cc1:ItemTemplate>

                                <cc1:ItemTemplate ID="dteTemplate7" runat="server" TemplateID="seventhDayDateHeaderTemplate">

                                    <Template>

                                        <asp:LinkButton runat="server" CssClass="AssignmentButton" ID="lbtnSeventhDay" PostBackUrl="../ApplicationForms/ManagerInterface/WOScheduler.aspx"

                                            CommandName="ASSIGN_SEVENTH_DAY"><%= currDay.AddDays(6).ToShortDateString() %></asp:LinkButton>

                                    </Template>

                                </cc1:ItemTemplate>

                            </Templates>

                            <Behaviors>

                                <ig:Selection CellClickAction="Row"></ig:Selection>

                            </Behaviors>

                            <EmptyRowsTemplate>

                                <div style="text-align: center;">

                                    No records returned.

                                </div>

                            </EmptyRowsTemplate>

                        </ig:WebDataGrid>

                    </ContentTemplate>

                </asp:UpdatePanel>

            </div>

        </ContentTemplate>

    </emcor:WebPanel>

The link buttons all get set from a textbox datepicker value. What am I missing here?