Detail Columns
Select a country:

Click on one of the continents from the first column, to load its corresponding countries in the second detail column.

ASP.NET

<obout:Combobox id="cbo1" Title="Continents">
    <DetailColumns>
        <obout:DetailColumn ID="cbo2" Title="Countries">
        </obout:DetailColumn>
    </DetailColumns>
</obout:Combobox>

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