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Formlogin - How to avoid onshow event mainform if login fails


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FormLogin - How to avoid onshow event mainform if login fails
I have the following problem.
In onshow the mainform have some events.
What happens is that if the login fails, this running these events.
What I see is that even before validating the result of FormLogin the mainshow is already running.
Is that so?


procedure TfrLogin.btnOKClick(Sender: TObject);
        ModalResult := mrNone;
     if not DataModel.link.Util.ValidaSenha(edtsenha.Text,qryUsuario.FieldByname('senha').AsString) then
          DataModel.link.Mensagem.Alerta('Acesso inválido, verifique a senha digitada.');
          edtSenha.text := '';
     UniMainModule.Usuario.Codigo := qryUsuario.FieldByName('codigo').AsInteger;
     UniMainModule.Usuario.Nome := qryUsuario.FieldByName('nome').AsString;
     UniMainModule.Empresa.Codigo := qryEmpresa.FieldByName('codigo').AsInteger;
     UniMainModule.Empresa.Nome := qryEmpresa.FieldByName('nome').AsString;
     UniMainModule.Empresa.Fantasia := qryEmpresa.FieldByName('nomefantasia').AsString;
     ModalResult := mrOK;
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