How can a components Event Method be set to nothing?

Basically, the opposite of assigning a method at run-time via the OnClick = OnClickHandler.

OnClick := nil     // does not work.

Trinione,

They all work as expected.
At what stage you are trying to set OnClick.
May be you are doing it before the component loading stage so that your assignments are overridden.

Emin Borbor

procedure TForm1.NewHandlerForClick(Sender: TObject);
begin
  ShowMessage('NewHandlerForClick', '');
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  ShowMessage('Button1Click', '');
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  Button1.OnClick := nil;
end;

procedure TForm1.Button3Click(Sender: TObject);
begin
  Button1.OnClick := NewHandlerForClick;
end;

<< They all work as expected. >>

Emin:
Yes, it works. My error was I forgot to chamne the parameter of the function from a TControl to a TForm. As the event method (OnAnimationComplete) does not exist for a TControl the error occured.

Thanks you,
Trinione,