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Dropdown data entry

Is there any sample code that shows a drop down box being used in a WebHierarchicalDataGrid?

I get my code to work until I put the dropdown in the form. Then when I attempt to update I get the message:

Failed to load viewstate.  The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request.  For example, when adding controls dynamically, the controls added during a post-back must match the type and position of the controls added during the initial request.

I follow the video sample for a WebDataGrid and that behaves just fine with the same datasource and update commands. Has anyone got this functionality to actually work? I'm at a loss and a sample markup that actually works would be a godsend.