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How to detach and re-attach an event

If, for any reason, you want to detach (remove) the code you have written in an event handler, you have to set the event handler to nil.

procedure TForm1.Button1Click(Sender: TObject) ;
begin
  ShowMessage('Who clicked?') ;
  //remove event handler from event
  Button1.OnClick := nil;
end;

To re-assign the procedure Button1Click to the button's OnClick event, you should use:

Button1.OnClick := Button1Click;

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