EDIT

import eu.etaxonomy.vaadin.event.FieldReplaceEvent;

    protected void unbindField(Field field){

        fieldGroup.unbind(field);

    }

    protected AbstractField<String> replaceComponent(String propertyId, AbstractField<String> oldField, AbstractField<String> newField, int column1, int row1, int column2,

            int row2) {

                String value = oldField.getValue();

                newField.setValue(value);

                newField.setCaption(oldField.getCaption());

                GridLayout grid = (GridLayout)getFieldLayout();

                grid.removeComponent(oldField);

                unbindField(oldField);

                addField(newField, propertyId, column1, row1, column2, row2);

                getViewEventBus().publish(this, new FieldReplaceEvent(this, oldField, newField));

                return newField;

            }