stringlistcontainer OnChanging event
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Applies to
acStringListContainer component.  

property OnChanging: TNotifyEvent;  

The OnChanging event occurs when the content in the is about to be changed (before the actual changes).  
Write OnChanging event handler to take some specific actions when the string list is about to be changed, or use OnChange to be notified when the list already has been changed.  

See also
OnChanging event.