What we do is make our data model pure but make a new view class based on that with things like Ishighlighted. Eg

Class Entity

Class EntityView : Entity

{

Public bool isHighlighted;

}

Or alternatively

Class EntityView

{
 Public Entity entity

  Public bool isHighlighted;

}

That way you can connect EntityView to the UI and keep the data object Entity "pure". Crud and other operations can simply use the underlying Entity by reference EntityView.Entity.