1) How can I get index of selected item from combo box after I selected an item?
Code:
        final ComboBox<State> combo = new ComboBox<State>(states, props.name());
        combo.addValueChangeHandler(new ValueChangeHandler<State>() {


            @Override
            public void onValueChange(ValueChangeEvent<State> event) {
                //event.getValue() is ok
                //combo.getValue() I get always null 
            }
        });
2) How can I get index or value of selected item from combo box from "outside"?
Code:
        final ComboBox<State> combo = new ComboBox<State>(states, props.name());
        Button button = new Button("GetValue", new ClickHandler() {


            @Override
            public void onClick(ClickEvent event) {
                //combo.getValue() returns selected item string, not even proper type of declared generic field
            }
        })
3) ComboBox: setForceSelection doesn't work
4) ComboBoxselect(int index) and combo.select(T item) doesn't work,
5) TabbedPanel setPlain(true) doesn't work,
6) No grid plugins (row numberer, expander, ...)