Button besonderes markieren

[Delphiturbo]

Ich habe so versucht :

Delphi-Quellcode:

procedure TForm1.FormCreate(Sender: TObject);
var
btn: TControl;
begin
Btn := TControl(FindComponent('BitBtn' + Edit1.Text));
end;
procedure TForm1.BitBtn1MouseMove(Sender: TObject; Shift: TShiftState; X,
  Y: Integer);
begin

Highlight(Btn);
//Incompatible types: 'TWinControl' and 'TControl'

end;