In my SfDataForms, if I use an Enum to fill a field, it works as expected, showing a Combo where I can select any valid value of my Enum, but sadly it's initially rendered with a value. But if I use a nullable enum, the field is initially rendered empty, but the combobox is not shown, a generic text input box is shown.
How can I have a Enum with combobox but starting with empty value?