Capture event from custom.pll?

Hi friends,
I've been reading in Developers Guide about events capture (p.787) in custom.pll but I've not found anything about capture the event (or something similar) whe we close a descriptive flexfield window....
Is there any way to know from custom.pll when a window is closed? The purpose is to make diferents actions when the focus return to the original form.
Thanks.
Jose.

Does the WHEN-FORM-NAVIGATE event fire when closing one form and returning to another? However I am pretty sure that this fires when switching between forms without closing one of them as well.

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