Update during modified field action - problem

hi,

 I use ax 2009. On form in AX I am modifing field. AX is triggering modified field method on table. After super() I am doing update on this record:

contactPerson.selectForUpdate(true);
....
contactPerson.update();

After this action on form I have old value for field. I have to refresh form to see new version.

How should I do update to see new value for fields?

regards,

Jacek