@Override
public void selectedItemChanged(EventObject event) {
// This is a special case: we don't want to keep a refreshable source, only to set a value
String item = ((ComboBox) getComponent()).getSelectedValue();
if ((item != null) && (!item.trim().isEmpty())) {
IKey key = new TangoKey();
TangoKeyTool.registerCommand(key, m_helper.getDeviceName(), item);
AbstractDataSource<?> dao = refreshingManager.createDataSource(key);
if (dao != null) {
dao.setData(null);
}