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;