anchor.diff:      //show
       FOptShowScrollArrows: boolean;
       FOptShowScrollMark: boolean;
  +    FOptShowDropMark: boolean;
       FOptShowXButtons: TATTabShowClose; //show mode for "x" buttons
       FOptShowPlusTab: boolean; //show "plus" tab
       FOptShowPlusText: atString; //text of "plus" tab
  
positive.code: 
    FOptShowScrollArrows:= true;
    FOptShowScrollMark:= true;
    FOptShowXButtons:= tbShowAll;
    FOptShowPlusTab:= true;
    FOptShowPlusText:= ' + ';
  
negative.code:     FScrollPos: integer;
      FImages: TImageList;
      FBitmap: TBitmap;
  
      //events    
      FOnTabClick: TNotifyEvent;
      FOnTabPlusClick: TNotifyEvent;
      FOnTabClose: TATTabCloseEvent;
  