public <T> void registerProperty(ListProperty<T> property,@NonNls String itemTagName, Externalizer<T> itemExternalizer) {
    registerProperty(property, createListExternalizer(itemExternalizer, itemTagName));
  }
public <T> void registerProperty(ListProperty<T> property,@NonNls String itemTagName, Externalizer<T> itemExternalizer)