Inplace Edit Control not shown if dynamic data types are nullable types with a null value e.g NumericEdit type Declined - Already Fixed

I have implement a Dynamic Generic type property collection with a DynamicObject Interface (Implementation) TryGetMember(), TrySetMember(), GetDynamicMemberNames(). If a nullable value type like int?, double? etc. has a value like null the TryGetMember() will cast the nullable value to object result of null. The type now were lost and the inplace Edit of the DataGrid will not be shown. But I have set the type of the edit control of the grid to NumericEdit? How can I edit nullable values with using the DynamicObject interface? I can't use a data class with members because I get dynamic values (e.g some nullable types) from the database and I convert it to a dictionary of dynamic property types. Is it possible the set the type of an inplace edit control (NumericEdit) to a specific type like int?, double?, float? because now the type identification of reflection will not be work for this problem.