ValuesList is the interface of an adapter that lists a set of values. It can be the interface of any object that supports the IValuesListAdapter interface, such as TStringsValuesList or TDataSetValuesList. Each value in the list that this adapter maintains represents a possible value for this field. This is useful when you want to restrict the possible values a user can assign to the associated database field. 

When you assign a value to the ValuesList property, the default control for editing this fields value changes to a single selection list box. 

TStringsValuesList 

TDataSetValuesList 

GetInputStyleType