A ComboBoxTag references a DataCollection in the context hierarchy and creates an HTML select element using the collection's inner elements.
Mandatory attributes
dataNameForList, dataName
If the DataCollection is an IndexedCollection, item and value are mandatory.
combo tag attributes
dataNameForList
ID of the DataCollection.
If the DataCollection is a KeyedCollection, each inner DataField corresponds to an option element. The combo box uses the field ID as the option label and the field value as the option value.
If the DataCollection is an IndexedCollection, the inner elements must be KeyedCollections, and the item and value attributes are mandatory. Each inner KeyedCollection corresponds to an option element. The combo box uses the collection field named in the item attribute as the option label and uses the collection field named in the value attribute as the option value. If the data element named dataName contains the value of an option element, the combo box highlights this option element as selected (it is the default).