Bug 315281 update copyrights for 3.6
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/dialogs/ResourceTreeAndListGroup.java
private Object root;
    private Object currentTreeSelection;
    private Collection expandedTreeNodes = new HashSet();
    private Map checkedStateStore = new HashMap(9);
    private Collection whiteCheckedTreeItems = new HashSet();
    private ITreeContentProvider treeContentProvider;
    private IStructuredContentProvider listContentProvider;
    private ILabelProvider treeLabelProvider;
    private ILabelProvider listLabelProvider;
    
    private CheckboxTreeViewer treeViewer;
    private CheckboxTableViewer listViewer;
    
    private static int PREFERRED_HEIGHT = 150;
    /**
     *	Create an instance of this class.  Use this constructor if you wish to specify
     *	the width and/or height of the combined widget (to only hardcode one of the
     *	sizing dimensions, specify the other dimension's value as -1)
     *  
     * @param parent
     * @param rootObject
     * @param treeContentProvider
     * @param treeLabelProvider
     * @param listContentProvider
     * @param listLabelProvider
     * @param style
     * @param useHeightHint If true then use the height hint
     *  to make this group big enough
     *
     */