FieldNotify members declared on a base class never update their bindings on objects of a derived class.
Example: bIsSelected (FieldNotify) is declared on a list item base class, XAML binds {Binding bIsSelected} on rows whose objects are of a derived class; the initial value is shown, later changes are not.
Cause: each NoesisTypeClass registers only the field notifications of its own UClass (properties and functions iterated with ExcludeSuper), and SetObjectFieldNotifications binds only the notifications of the object's most derived type class.
Repro:
UCLASS()
class UExampleItemBase : public UMVVMViewModelBase
{
GENERATED_BODY()
public:
UPROPERTY(BlueprintReadOnly, FieldNotify, Category="Example")
bool bIsSelected = false;
void SetSelected(bool bValue) { UE_MVVM_SET_PROPERTY_VALUE(bIsSelected, bValue); }
};
UCLASS()
class UExampleItem : public UExampleItemBase // no FieldNotify members of its own needed
{
GENERATED_BODY()
};
<ToggleButton IsChecked="{Binding bIsSelected, Mode=OneWay}"/> <!-- DataContext: a UExampleItem -->
Steps: set an UExampleItem as DataContext, read the initial value (correct), call SetSelected(true).
Expected: the binding updates.
Actual: it keeps the initial value. The same member declared directly on UExampleItem updates. | 
