Thank you very much Liz,
i got the mail. Unfortunately in my installation(wf263.zip) the directory <ORACLE_HOME>\wf\java\oracle\apps\fnd\wf\ is empty. I dont know why, but from the same file(wf263.zip) i made another installation and the directory is also empty. Thank you again for the mail.
Could you please send a copy of WFTest.java to me? My copy was de-compiled java fime from a WFText.class in wfapi.jar. It's not been probably formatted, I need a copy from you then.