Form personalization on when-button-pressed trigger event

Hi Gurus,

can we perform some action like showing a error message when a button is clicked on the Oracle form? I do not see any Trigger Event "WHEN-BUTTON-PRESSED' under the Condition tab of form personalization screen. however there is a mention next to Trigger Event drop down which says - "You can enter additional event name" .

so is it possible to use WHEN-BUTTON-PRESSED directly form personalization without opening the custom.pll?

I am working on the WIP Job completion UI "CONTINUE" button. I tried below steps but its not working.