Which trigger gets fired when a filed (item) get populated

Hi,
Which (item level) trigger gets fired when a filed (item) get populated with data
Thank you

Thanks for the responce. But....please read the following and try to understand the probelm.
I have a screen in Oracle Forms.
For example the screen is EMP and I have a LOV on item: EMPNO
After selecting an EMPNO from the LOV, I click on a button and the button's trigger (WHEN-BUTTON-PRESSED)
populates the remaining items with data related to the EMPNO in the EMPNO item which I selected from the LOV.
Here is the request: I want the items get populated when I select the EMPNO from the LOV.
I copied the code from WHEN-BUTTON-PRESSED (which is populating the data into other fields) to the triggers you mentioned
(pre-text-item, when-new-item-instance, when-validate-item, post-text-item)
But they are not working (the data is not populating when I select EMPNO from LOV)
I am a DBA not a developer, but I have to do this. So please help me and let me know how to do this.
I hope you understand the request.
Thank you

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Which trigger gets fired when a filed (item) get populated

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