anchor.diff:        FColorBg);
     end;
   
  -  //paint drop mark
  -  if DragManager.IsDragging then
  -  begin
  -    if PtInControl(Self, Mouse.CursorPos) then
  -      DoPaintDropMark(C);
  -  end;
  -
  -  //paint scroll mark
  +  if FOptShowDropMark then
  +    if DragManager.IsDragging then
  +      if PtInControl(Self, Mouse.CursorPos) then
  +        DoPaintDropMark(C);
  +
     if FOptShowScrollMark then
       DoPaintScrollMark(C);
   end;
  
positive.code:     property OptShowAtBottom: boolean read FOptShowAtBottom write FOptShowAtBottom;
      property OptShowScrollArrows: boolean read FOptShowScrollArrows write FOptShowScrollArrows;
      property OptShowScrollMark: boolean read FOptShowScrollMark write FOptShowScrollMark;
      property OptShowXButtons: TATTabShowClose read FOptShowXButtons write FOptShowXButtons;
      property OptShowPlusTab: boolean read FOptShowPlusTab write FOptShowPlusTab;
      property OptShowPlusText: atString read FOptShowPlusText write FOptShowPlusText;
  
negative.code:     //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
  