From Xojo Documentation
| This item was deprecated in version 2018r4.
The DataControl that references a table in a database whose fields are displayed.
Use the DataField property to link a field to be displayed in a PopupMenu. In the IDE, a popup menu of field names will appear. When setting in code, it takes a String. Assign it to the Name property of a DataControl. Note: Database fields can also be displayed via a DataControl using ComboBoxes, TextFields and TextAreas, ListBoxes, CheckBoxes, and StaticText controls.
The following specified the datasource and datafield for the control.