add(mainPanel, BorderLayout.NORTH);
languageComboBox.addDialogListener(parent);
time12RadioButton.addDialogListener(parent);
time24RadioButton.addDialogListener(parent);
dateFormatComboBox.addDialogListener(parent);
dateSeparatorField.addDialogListener(parent);
showSecondsCheckBox.addDialogListener(parent);
showCenturyCheckBox.addDialogListener(parent);
}