Replace number field with picker

Hi.

I need to build WTPart number in create wizard based on some classifier. Classifier item should be selected by user through picker.

So i created datautility that uses PickerInputComponent.

But now PickerInputComponent's input field has no binding to wtPart number. Windchill considers number as null and generates itself.

PickerInputComponent.setId() and PickerInputComponent.setColumnName() do not solve problem.

What can i do?

May be should i use another approach to solve problem?

Thanks.