[ecfisa]

Hola jandro.

Código Delphi [-]
 ...
 private
     procedure CreateParams(var Params: TCreateParams); override;
 end; 
...
implementation
...
procedure TForm1.CreateParams(var Params: TCreateParams) ;
begin
  BorderStyle:= bsNone;
  inherited;
  Params.ExStyle:= Params.ExStyle or WS_EX_STATICEDGE;
  Params.Style:= Params.Style or WS_SIZEBOX;
end;
...

Un saludo.