i write this plsql in the form trigger (WHEN-NEW-FORM-INSTANCE)
then i go to property palette and change visible option to (NO)
and when i run the form didn't work and show me this message :
FRM-47207: in this release, play_sound can only be run against the current item
then i go back and change the visible option to (YES)
then the idea come to change the size of sound item? height and width make all to zero
and now its work fine ...
thanks Julius Z