anchor.diff:    FComboBox.DropDownCount:= 20;
     FLabel := Self.CreateStandardLabel;
     FGarbage := TObjectList.Create(true);
  +  FDefaultItemIndex:= -1;
   end;
   
   destructor TmComboFilterConditionPanel.Destroy;
  
positive.code: 
  procedure TmComboFilterConditionPanel.Clear;
  begin
    FCombobox.ItemIndex:= -1;
    FCombobox.Text:= '';
  end;
  
  function TmComboFilterConditionPanel.IsEmpty: boolean;
  
negative.code:     FLabel : TLabel;
      FCombobox: TComboBox;
      FGarbage : TObjectList;
      FDefaultItemIndex : integer;
      procedure SetDefaultItemIndex(AValue: integer);
    public
      constructor Create(TheOwner: TComponent); override;
      destructor Destroy; override;
  