banner not show when scheduled task

[jsbach]

i've a routine that shows a banner (modified dialog 111 in modern.exe UI) as usual (banner:show...).
The dialog is shown if i run the script manually but it doesn't if the script is run as scheduled task.
The banner is called insided .OnInit: is this the problem ?
I remember i saw some similar post: not sure; anycase i've urgent need to fix this so i have to post the issue in advance.
appreciates any help. thanks.