String languageLabel = EditorMessages.propertiesLanguageTitle;
toolkit.createLabel(composite, languageLabel);
// toolkit.createSeparator(composite, SWT.SEPARATOR);
Combo combo = new Combo(composite, SWT.NONE | SWT.BORDER);
combo.setItems(new Languages().languageArray());
toolkit.adapt(combo, true, true);
ISWTObservableValue comboValue = WidgetProperties.selection().observe(combo);
Forms.bindBeanProperty(bindingContext, mmng, expression, "language", isMandatory(expression, "language"), languageLabel, comboValue, combo);