code: @OverrideOnDemand
    public void beforeAddRenderedMenuItem (@Nonnull final IWebPageExecutionContext aWPEC,
                                           @Nonnull final IMenuObject aMenuObj,
                                           @Nullable final IHCElement <?> aPreviousLI)
    {
      if (aMenuObj.getMenuObjectType () == EMenuObjectType.SEPARATOR && aPreviousLI != null)
        aPreviousLI.addStyle (CCSSProperties.MARGIN_BOTTOM.newValue ("1em"));
    }
docs: Called before a menu item is rendered.
  
  @param aWPEC
  Web page execution context. May not be <code>null</code>.
  @param aMenuObj
  The menu object about to be rendered. Never <code>null</code>.
  @param aPreviousLI
  The previous element from the last call. May be <code>null</code>.