public void setValue(int index, String value) {
        index += getIndexOffset();
        listBox.setValue(index, value);
        reload();
    }
public void setValue ( int index , String value ) { index += getIndexOffset ( ) ; listBox . setValue ( index , value ) ; reload ( ) ; }
Sets the value associated with the item at a given index. This value can
be used for any purpose, but is also what is passed to the server when
the list box is submitted as part of a {@link FormPanel}.

@param index the index of the item to be set
@param value the item's new value; cannot be <code>null</code>
@throws IndexOutOfBoundsException if the index is out of range