combobox.setSelectedItem(null);
combobox.addItemListener(new ItemListener() {
@Override
public void itemStateChanged(ItemEvent itemEvent) {
JsonDataType selectedType = (JsonDataType) combobox.getSelectedItem();
currentDataType = selectedType;
currentEditor = UI_COMPONENT_BY_JSON_DATATYPE.get(selectedType);
currentEditor.reset();
parentPanel.invalidate();