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dhtmlxcombo in ASP.NET UpdatePanel causes postback

I'm using a dhtmlxcombo inside an UpdatePanel in an ASP.NET 2.0 aspx page.

The combo renders correctly on the page using the following script, which is inside an UpdatePanel:

<td width="666" height="22" colspan="5" bgcolor="#ffffff">
<asp:DropDownList AutoPostBack="true"
ID="BoatModel" runat="server" Width="341" OnSelectedIndexChanged="BoatModel_SelectedIndexChanged"
DataSourceID="BoatModelDataSource" DataTextField="ModelName"
DataValueField="ID"></asp:DropDownList>
var z=dhtmlXComboFromSelect("ctl00_WebPageContent_BoatModel");
z.setOptionHeight(300);
z.readonly(true);
</td>

However, when I change the selection in the drop-down, the page is updated with a flicker. It looks like the UpdatePanel / ScriptManager code does not recognize the event coming from the dhtmlxcombo as it would from the select genrated by the <asp:DropDownList>

If I remove the dhtmlxcombo code, the page updates correctly under AJAX, without a page-flicker.

Is there any solution to make the dhtmlxcombo update the page without a flicker?