Ajax AutoCompleteExtender showing multiple columns

Question

Hi there,

I have a asp.net web page using a autocompleteextender:

<ajaxToolkit:AutoCompleteExtender runat="server" ID="ctrl_masch_kdnr_extender" TargetControlID="ctrl_masch_kdnr_v"
                        ServiceMethod="GetData_CustomerNo" MinimumPrefixLength="2" CompletionInterval="200"
                        EnableCaching="true" CompletionSetCount="20" CompletionListCssClass="autocomplete_completionListElement"
                        CompletionListItemCssClass="autocomplete_listItem" CompletionListHighlightedItemCssClass="autocomplete_highlightedListItem"
                        DelimiterCharacters=";,:" UseContextKey="True">
                    </ajaxToolkit:AutoCompleteExtender>

The extender retrieves information using a webservice. The generated popup from the autocompleteextender shall include several columns (not just only one).

Problem description: Popup of AutoCompleteExtender shall display multiple columns. After selecting an entry it shall only copy the first column into the textfield the completer is linked with.

Does anybody knows a soltuion to do this?

Any help is highly appriciated.