formhook OnFormShown events
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Applies to
acFormHook component.  

property OnFormShown: TNotifyEvent;  

The OnFormShown event occurs at once the form are displayed on the screen and all contents already painted.  
Write this event handler if you wish to make some specific actions when the form just appears on the screen with all its contents. Unlike standard OnShow event of the form which occurs before the form actually shown, and unlike OnActivate, which occurs every time when the form is activated-reactivated, this event occurs just once, when everything is painted.