Oracle Forms

Oracle 10g
Forms Builder 10.1.2.0.2
Windows XP

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Hello everyone, I am a newbie in Oracle Forms, really need help to figure out the issue of Pre-insert trigger.

I created form DEPT by following a tutorial, then data block DEPARTMENT was generated by data block wizard. at this stage, I got everything runs well, data appears correctly. So I want to use an Oracle Sequence in datablock which should generate & display the new ID in the field when user click on icon "Insert Record"on toolbox.

Firstly, the auto_sequence runs correctly by SQL*PLUS
*********************************************
select DEPT_ID_SEQ.nextval from DUAL;
*********************************************


Then I insert code as follows in trigger PRE-INSERT of DATA BLOCK.

*****************************************************
type: trigger
object: department - Data Block Level
*****************************************************
begin
select DEPT_ID_SEQ.nextval
into :DEPARTMENT.ID
from DUAL;
end;
****************************************************


finally, I save + compile module + run form, I didn't see an auto-generated ID in the ID field once I clicked the icon "insert records".

Then I made a button call "New ID", then inserted the code above into button's trigger "WHEN-BUTTON-PRESSED", re-run the form, it works!

For my understand, the icon "Insert Record" on toolbar doesn't active the trigger "PRE-INSERT".

Why?