Forms. How to make select and chosen lists with categories (optgroup)

To do this you must specify the name of the parent label for each select element

select ' Not selected '  Text,  0 Value, 0 Selected, '  '  OptGroup
select title Text, id Value, 0 Selected, cast(len(title) as nvarchar) OptGroup from as_mt_metrics
order by OptGroup, Text

It is very important that the sorting is by OptGroup  and the first element must have a non-empty optGroup

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