Sys$WebForms$PageRequestManager$_matchesParentIDInList(clientID, parentIDList) {

    for (var i = 0, l = parentIDList.length; i < l; i++) {

        if (clientID.startsWith(parentIDList[i] + "_")) {

            return true;

        }

    }

    return false;

}

On this page I have 3 RadGrids and if I remove the one with the following code evrything works fine.

<

telerik:RadGrid ID="gvExpenseAssignments" runat="server" AutoGenerateColumns="false" Height="570">

    <ClientSettings EnableRowHoverStyle="true">

        <Scrolling AllowScroll="true" ScrollHeight="550" UseStaticHeaders="true" />
    </ClientSettings>

    <MasterTableView DataKeyNames="GL_Account_Template_Id" EditMode="InPlace" AllowMultiColumnSorting="false"

            TableLayout="Fixed" AllowNaturalSort="false" Width="99%">

        <Columns>

            <telerik:GridBoundColumn DataField="ItemsString" Visible="false" UniqueName="strHintItems"></telerik:GridBoundColumn>

            <telerik:GridBoundColumn DataField="GL_Account_Name" HeaderText="Account Name" ReadOnly="true" AllowSorting="true" HeaderStyle-Width="260"></telerik:GridBoundColumn>

            <telerik:GridButtonColumn Text="Hint" runat="server" CommandName="cmdHint" HeaderText="Account Items" ShowInEditForm="true" HeaderStyle-Width="65px" ItemStyle-Width="65px"></telerik:GridButtonColumn>

            <telerik:GridButtonColumn Text="Suggest" runat="server" CommandName="cmdSuggest" HeaderText="Mapping Assistant" ShowInEditForm="true" HeaderStyle-Width="65px" ItemStyle-Width="65px"></telerik:GridButtonColumn>

            <telerik:GridBoundColumn DataField="GL_Account_No" HeaderText="Linked Account No" UniqueName="lblAcctNo" ReadOnly="true" AllowSorting="true"></telerik:GridBoundColumn>

            <telerik:GridBoundColumn DataField="Cust_GL_Account_Name" HeaderText="Linked Account Name" UniqueName="lblAcctName" ReadOnly="true" AllowSorting="true"></telerik:GridBoundColumn>

        </Columns>

    </MasterTableView>

</telerik:RadGrid>

The whole aspx file is attached as an image file. I get the same behavior wether I data bind the grid or not. The issue that I have found is that clientID in the javascript function is a function and not a string so it contains no method startsWith. I have found a workaround that creates an anonomous function for startsWith -

Function.prototype.startsWith = function(){return false;};

but I would like to be able to find a mor permanent fix or what I am doing that is causing the error to begin with.

Thank you.

I'm displaying a context menu when right-clicking a radgrid. How do I access radgrids columns?

Thanks for the help!