private void setFieldValue(final DocRef value) {
        setFieldValue(value, null);
    }
@param docRef             The {@link DocRef} to set as the selected value of the dropdown.
                          If docRef does not exist or is not visible to the user, a warning
                          will be displayed but the value will be as passed.
@param decorateDocRef     If true, force decorate docRef to ensure it has the correct name.
                          Set to false if you know docRef has an up-to-date name, is a constant,
                          is definitely null, or you don't care.
@param onDocRefDecoration Called when docRef is found to be different to a
                          decorated version of it, e.g. it's name has changed.
@param onDocRefNotFound   Called docRef does not exist, e.g. it has been deleted
                          or its permissions have changed.
stroom-core-client/src/main/java/stroom/explorer/client/presenter/DocSelectionBoxPresenter.java