Error when defining a generic Composite widget using Java Generics

[Steen Lillethorup Frederiksen]

I am trying to create a generic Composite widget, using Java Generics. 
However I keep getting the assertion error:

java.lang.AssertionError: This UIObject's element is not set; you may be 
missing a call to either Composite.initWidget() or UIObject.setElement()


I have defined my Composite widget as follows:

public class DataEntry<DataType extends FocusWidget> extends Composite {

    final protected FlowPanel panel;
    final protected InlineLabel promptLabel;
    final protected DataType inputElement;
    
    public DataEntry(final DataType inputField, final String guiId, final 
String prompt) {
        super();

        promptLabel = new InlineLabel(prompt);
        inputElement = inputField;

        panel = new FlowPanel();
        panel.add(promptLabel);
        panel.add(inputField);
        initWidget(panel);

        getElement().setId(guiId);
        promptLabel.setStylePrimaryName("dio-DataEntry-Prompt");
        inputElement.setStylePrimaryName("dio-DataEntry-Input");
    }

And I am defining my concrete Composite widgets as follows (could be 
TextBox, TextArea etc.):

public class ListEntry extends DataEntry<ListBox> {
    public ListEntry(String guiId, String prompt) {
        super(new ListBox(), guiId, prompt);
    }
    ...
}

Can anyone explain to me, what I have missed here?

Thanx
Steen

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