Property property = getStyleProperty("setStyleName('second')");
PropertyEditor propertyEditor = property.getEditor();
// activate
propertyTable.setInput(new Property[]{property});
propertyTable.setActiveProperty(property);
propertyTable.activateEditor(property, null);
CComboBox combo = (CComboBox) getFieldValue(propertyEditor, "m_combo");
Text comboText = (Text) getFieldValue(combo, "m_text");
Table comboTable = ((TableViewer) getFieldValue(combo, "m_table")).getTable();
// has items
assertEquals(3, combo.getItemCount());