I think I am missing a selected value on the RACB which doesnt exist.
<telerik:GridBoundColumn DataField="Customer" HeaderText="Customer" ReadOnly="true" >
<FilterTemplate>
<telerik:RadAutoCompleteBox runat="server" ID="RadAutoCompleteBox2" DataSourceID="EntityDataSource3" Filter="Contains" OnClientEntryAdded="entryAdded" AllowCustomToken="true"
DataTextField="Customer" DataValueField="Customer" InputType="Token">
</telerik:RadAutoCompleteBox>
<telerik:RadScriptBlock ID="RadScriptBlock3" runat="server">
<
script type="text/javascript">
function entryAdded(sender, eventArgs) {
var tableView = $find("<%# ((GridItem)Container).OwnerTableView.ClientID %>");
tableView.filter(
"Customer", eventArgs.get_entry().get_text(), "EqualTo");
}
</
script>
</telerik:RadScriptBlock>
</FilterTemplate>
</telerik:GridBoundColumn>