I have UI Control classes that have a Data property, can I restrict the Data class property to be one of Filter’s child classes: FilterRange, FilterSet, FilterValue? So Data must be a class that has base class Filter.

UIFilterControl
|-- UIControlRangeSlide
|    * Data: FilterRange
|-- UIControlSearchSelector
|    * Data: FilterSet

Filter and it’s child classes:

Filter
|- FilterRange
|- FilterSet
|- FilterValue
|- ...