constructor TMainForm.Create(AOwner: TComponent);
begin
  Inherited Create(AOwner);
  SetWindowLong(ClientHandle, GWL_EXSTYLE,
  GetWindowLong(ClientHandle,
  GWL_EXSTYLE) or WS_EX_CLIENTEDGE);
  SetWindowPos(ClientHandle, 0, 0, 0, 0, 0,
    swp_DrawFrame or swp_NoMove or swp_NoSize
    or swp_NoZOrder);
end;