Combo Box Widget: support optgroup

By Carlos Henriques on 22 Mar 2012
"The OPTGROUP element allows authors to group choices logically. This is particularly helpful when the user must choose from a long list of options; groups of related choices are easier to grasp and remember than a single long list of options. In HTML 4, all OPTGROUP elements must be specified directly within a SELECT element (i.e., groups may not be nested)."

from: HTML 4.01 Specification

Combo box with optgroup support would be very helpful.
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