RAD Studio VCL Reference
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Occurs immediately before the list of strings changes.
property OnChanging: TNotifyEvent;
__property TNotifyEvent OnChanging;
Write an OnChanging event handler to prepare for changes in the list of strings. For example, if the string list is associated with a control, the OnChanging event handler could tell the control to disable repaints until the OnChange event when the list has finished changing.
Whenever strings in the list are added, deleted, moved, or modified, the following events take place:
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