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
catch (SemanticException e1)
                    {
                        
                        e1.printStackTrace();
                    }
                }
            });
            viewer.getTable().setMenu(menu);
        }
        
        if(enableKeyStrokes)
        {
            viewer.getTable().addKeyListener(new KeyListener(){
                public void keyPressed(KeyEvent e)
                {
                }
                public void keyReleased(KeyEvent e)
                {
                    if ( e.keyCode == SWT.DEL )
                    {
                        removeSelectedItem();
                    }
                }
                
            });
        }
    }
    
    public TableViewer getViewer()
    {