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
return itmRemove;
    }
    
    public MenuItem getRemoveAllMenuItem()
    {
        return itmRemoveAll;
    }
    
    private final void removeSelectedItem()
    {
        int index = viewer.getTable( ).getSelectionIndex( );
        PropertyHandle handle = (PropertyHandle) viewer.getInput();
        int count = (handle.getListValue() == null)?0:handle.getListValue().size(); 
        
        if ( index > -1 && index < count )
        {
            try
            {
                handle.removeItem( index );
            }
            catch ( PropertyValueException e1 )
            {
                ExceptionHandler.handle( e1 );
            }
            viewer.refresh( );
            viewer.getTable( ).select( index );
        }
    }
}