I know there are a few posts that show the same error but I have tried them and nothing is working for me.  So I am going to try to describe my situation:

I have a web application with several ASPX page with a grid on it.  Below is the syntax I am currently using:

<%

@ Register Assembly="Infragistics2.WebUI.UltraWebGrid.v8.3, version=8.3.20083.1009, Culture=neutral, PublicKeyToken=################" Namespace="Infragistics.WebUI.UltraWebGrid" TagPrefix="igtbl" %>

 <IGTBL:ULTRAWEBGRID id="wgInventory" tabIndex="4" runat="server" width="820px" height="310px">
     <Bands>
          <igtbl:UltraGridBand></igtbl:UltraGridBand>
     </Bands>
     <DisplayLayout RowHeightDefault="20px" SelectTypeRowDefault="Single"
       BorderCollapseDefault="Separate" RowSelectorsDefault="No"
       CellClickActionDefault="RowSelect">
          <AddNewBox>
               <BoxStyle BorderWidth="1px" BorderStyle="Solid" BackColor="LightGray">
                    <BorderDetails ColorTop="White" WidthLeft="1px" WidthTop="1px"
                      ColorLeft="White"></BorderDetails>
               </BoxStyle>
          </AddNewBox>
          <Pager>
               <PagerStyle BorderWidth="1px" BorderStyle="Solid" BackColor="LightGray">
                    <BorderDetails ColorTop="White" WidthLeft="1px" WidthTop="1px"
                      ColorLeft="White"></BorderDetails>
               </PagerStyle>
          </Pager>
          <HeaderStyleDefault CssClass="gridHeaderDefault">
               <BorderDetails ColorTop="White" WidthLeft="1px" WidthTop="1px"
                 ColorLeft="White"></BorderDetails>
          </HeaderStyleDefault>
          <GroupByRowStyleDefault CssClass=
            "gridGroupByRowDefault"></GroupByRowStyleDefault>
          <RowSelectorStyleDefault CssClass=
            "gridRowSelectorsDefault"></RowSelectorStyleDefault>
          <FrameStyle Width="825px" Height="300px" CssClass=
            "gridFrameDefault"></FrameStyle>
          <FooterStyleDefault CssClass="gridFooterDefault">
               <BorderDetails ColorTop="White" WidthLeft="1px" WidthTop="1px"
                 ColorLeft="White"></BorderDetails>
          </FooterStyleDefault>
          <RowExpAreaStyleDefault CssClass=
            "gridRowExpAreaDefault"></RowExpAreaStyleDefault>
          <SelectedHeaderStyleDefault CssClass=
            "gridSelectedHeaderDefault"></SelectedHeaderStyleDefault>
          <EditCellStyleDefault CssClass="gridEditCellDefault"></EditCellStyleDefault>
          <SelectedGroupByRowStyleDefault CssClass=
            "gridSelectedGroupByRowDefault"></SelectedGroupByRowStyleDefault>
          <SelectedRowStyleDefault CssClass=
            "gridSelectedRowDefault"></SelectedRowStyleDefault>
          <RowAlternateStyleDefault CssClass=
            "gridRowAlternateDefault"></RowAlternateStyleDefault>
          <RowStyleDefault CssClass="gridRowDefault" BorderColor="silver" BorderStyle="solid"
            BorderWidth="1px"></RowStyleDefault>
     </DisplayLayout>
</IGTBL:ULTRAWEBGRID>

In the .cs file I am calling my JavaScript by using the following, this code is inside of my wgInventory_InitializeLayout method:

ClientScript.RegisterStartupScript(

this.GetType(), "Startup", "<script language='javascript'>EditableAlternateRowsStyle2()</script>");

Inside of the JavaScript file I have the following:

function

EditableAlternateRowsStyle2()
{
     // getting the grid info
     var grid = igtbl_getGridById("wgInventory");
     .
     .
     .

When this line of JavaScript executes grid = undefined.
Why is this.  It works just fine on several other pages, but I get this on several pages as well.

Please Help.

Thank You,
Pat