Oracle Forms

I have an application in which several formal controls are made before insert/update a record. Some of them are blocking, some others arent.
Actually, at every constraint violation, a message is displayed with an alert. So, the user may got one or more alerts before he succeed in inserting/updating a record. And it may be annoying to click on 'OK' a lot of times!
So, I wish to collect all error message and display them in a window, which is to be displayed in a pop-up way (something like the alerts that appear at the bottom-right corner of our screen when we have new mail).
The issue is that the pop-up window must not disturb the user, i.e it should be displayed and iconized after few seconds, leaving the focus on the main window.
I tried several solutions, but each of them have some issues.

External HTML page: maybe its the easiest solution. But bluring it, the focus doesnt return to the form application.
New window: I can run and iconize it. But, as in the previous case, the main window lost the focus.
New canvas: I put a text item LOG_ERRORS in a new canvas, in the same main window. But when I run it, the main canvas disappear.

does anyone know how to create popup windows in forms 10g (if it is possible)?
thank you