The Transfer List widget is displayed instead of a regular HTML multiple selection control when configured in one of the two ways described below. In order for all multiple selection controls in an application to be displayed as Transfer List widgets, curam-config.xml should contain the TRANSFER_LISTS_MODE element with its value is set to true. Alternatively, individual multiple select controls might be configured to be displayed that way by setting the CONTROL attribute on the appropriate UIM FIELD to be TRANSFER_LIST. This setting is applicable just for fields rendered as multiple selection controls on the resulting UIM page and will be ignored in any other case.
The Transfer List widget requires the same data and the same configuration for enabling multiple selection as a regular selection list.