Hi!
I wrote a dialog to input valid car plates (Portuguese format: http://pt.wikipedia.org/wiki/Matr%C3...is_em_Portugal )using Qt Designer. It works just fine.

Then i tried to write it again, but now not using Qt Designer.
This second version works but i get the following message :

Qt Code: 
  1. Starting /home/torrao/Desktop/v7/automovel_sem_designer/automovel_sem_designer
  2. QWidget::setTabOrder: 'first' and 'second' must be in the same window
  3. QWidget::setTabOrder: 'first' and 'second' must be in the same window
  4. /home/torrao/Desktop/v7/automovel_sem_designer/automovel_sem_designer exited with code 0
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This must be an insignificant detail ... but i would apreciate some help

The code:
IdDoAutomovel.h
Qt Code: 
  1. #ifndef IDDOAUTOMOVELDIALOG_H
  2. #define IDDOAUTOMOVELDIALOG_H
  3.  
  4. #include <QDialog>
  5.  
  6. class QLabel;
  7. class QLineEdit;
  12. class QString;
  13. class QRegExp;
  14.  
  15. class IdDoAutomovelDialog : public QDialog
  16. {
  17.     Q_OBJECT
  18.  
  19. public:
  20.     IdDoAutomovelDialog(QWidget *parent = 0);
  21.  
  22. private slots:
  23.     void on_lineEdit_textChanged();
  24.  
  25. private:
  26.     QLabel *label;
  27.     QLineEdit *lineEdit;
  28.     QSpacerItem *horizontalSpacer;
  29.     QPushButton *okButton;
  30.     QPushButton *cancelButton;
  31.     QStringList *listaMatriculasValidas;
  32.     QVBoxLayout *verticalLayout;
  33.     QHBoxLayout *horizontalLayout;
  34.     QHBoxLayout *horizontalLayout_2;
  35. };
  36.  
  37. #endif // IDDOAUTOMOVELDIALOG_H
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IdDoAutomovel.cpp
Qt Code: 
  1. #include <QtGui>
  2.  
  3. #include "IdDoAutomovelDialog.h"
  4.  
  5. IdDoAutomovelDialog::IdDoAutomovelDialog(QWidget *parent):QDialog(parent){
  6.     //Label
  7.     label = new QLabel("&MatrÃ*cula:");
  8.  
  9.     //Line Edit
  10.     lineEdit = new QLineEdit;
  11.  
  12.     //Buddyes
  13.     label->setBuddy(lineEdit);
  14.  
  15.     //Spacer
  16.     horizontalSpacer = new QSpacerItem(40, 20, QSizePolicy::Expanding, QSizePolicy::Minimum);
  17.  
  18.     //OK Button
  19.     okButton = new QPushButton("Ok");
  20.     okButton->setEnabled(false);
  21.  
  22.     //CANCEL Button
  23.     cancelButton = new QPushButton("Cancel");
  24.     cancelButton->setObjectName(QString::fromUtf8("cancelButton"));
  25.  
  26.     //Validar a matrÃ*cula introduzida ( http://pt.wikipedia.org/wiki/Matr%C3%ADculas_autom%C3%B3veis_em_Portugal )
  27.     listaMatriculasValidas = new QStringList;
  28.     listaMatriculasValidas->append("[A-Za-z]{2,2}[-][0-9]{2,2}[-][0-9]{2,2}");
  29.     listaMatriculasValidas->append("[0-9]{2,2}[-][0-9]{2,2}[-][A-Za-z]{2,2}");      //or
  30.     listaMatriculasValidas->operator <<("[0-9]{2,2}[-][A-Za-z]{2,2}[-][0-9]{2,2}");
  31.     QRegExp regExp(listaMatriculasValidas->join("|"));
  32.     lineEdit->setValidator(new QRegExpValidator(regExp, this));
  33.  
  34.     //Definir acções
  35.     connect(lineEdit, SIGNAL(textChanged(const QString &)),
  36.             this, SLOT(on_lineEdit_textChanged()));
  37.  
  38.     connect(okButton, SIGNAL(clicked()),
  39.             this, SLOT(accept()));
  40.     connect(cancelButton, SIGNAL(clicked()),
  41.             this, SLOT(close()));
  42.  
  43.     //layout Dialog
  44.     horizontalLayout = new QHBoxLayout;
  45.     horizontalLayout_2 = new QHBoxLayout;
  46.     verticalLayout = new QVBoxLayout;
  47.  
  48.     horizontalLayout->addWidget(label);
  49.     horizontalLayout->addWidget(lineEdit);
  50.  
  51.     horizontalLayout_2->addItem(horizontalSpacer);
  52.     horizontalLayout_2->addWidget(okButton);
  53.     horizontalLayout_2->addWidget(cancelButton);
  54.  
  55.     verticalLayout->addLayout(horizontalLayout);
  56.     verticalLayout->addLayout(horizontalLayout_2);
  57.  
  58.     //Tab order
  59.     QWidget::setTabOrder(lineEdit, okButton);
  60.     QWidget::setTabOrder(okButton, cancelButton);
  61.  
  62.     setWindowTitle("MatrÃ*cula");
  63.     setLayout(verticalLayout);
  64. }
  65.  
  66. void IdDoAutomovelDialog::on_lineEdit_textChanged(){
  67.     okButton->setEnabled(lineEdit->hasAcceptableInput());
  68. }
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Thanks