RAD Studio VCL Reference
TBasicAction.OnChange Event

Occurs when one of the action's properties changes.

property OnChange: TNotifyEvent;
__property TNotifyEvent OnChange;

Applications can't use the protected OnChange event. It is used internally to manage the relationship between the properties of the action and the corresponding properties of the action's clients. 

Component writers can use OnChange in descendant objects to respond when the action's properties change. 


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