@Override
	public void addDropDownSelectionChoiceListener(DropDownSelectionChoiceListener<T> listener) {
		throw new UnsupportedOperationException(
			"Please use the flavor of this method that takes a " +
				DropDownMultiSelectionChoiceListener.class.getSimpleName() + " instance.");
	}
Adds the caller to a list of subscribers who will be notified when selection changes.

@param listener the subscriber to be added
Ghidra/Framework/Docking/src/main/java/docking/widgets/DropDownMultiSelectionTextField.java