Bug 123207 PropertyHandle items cannot be moved down
Use the property handle to move down the item. It seems not work.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/dialogs/PropertyHandleTableViewer.java
{
    private TableViewer viewer;
    private Composite mainControl;
    private Button btnRemove;
    private Button btnUp;
    private Button btnDown;
    private MenuItem itmRemove;
    private MenuItem itmRemoveAll;
    private Menu menu;
    
    /**
     * 
     */
    public PropertyHandleTableViewer(Composite parent, boolean showMenus, boolean showButtons, boolean enableKeyStrokes)
    {
        mainControl = new Composite(parent, SWT.NONE);
        GridLayout layout = new GridLayout();
        layout.numColumns = 2;
        mainControl.setLayout(layout);
        GridData data = null;
        viewer = new TableViewer(mainControl, SWT.FULL_SELECTION);
        data = new GridData(GridData.FILL_BOTH);
        viewer.getControl().setLayoutData(data);
        
        viewer.getTable( ).setHeaderVisible( true );
        viewer.getTable( ).setLinesVisible( true );
        if(showButtons)
        {
            Composite btnComposite = new Composite(mainControl, SWT.NONE);
            data = new GridData();