Reference THeaderColumn

  THeaderColumn = class(TCollectionItem)
  protected
    { The caption shown in the designer }
    function GetDisplayName: string; override;
    { Notify OnResize subscribers }
    procedure DoResize;
  public
    { Create a new column }
    constructor Create(ACollection: TCollection); override;
    { Subscribe to notifications when the column is resized }
    property OnResize: INotifyDelegate read GetOnResize;
    { The index of the column counting only visible columns }
    property VisibleIndex: Integer read GetVisibleIndex;
  published
    { The alignment of the caption }
    property Alignment: TAlignment read FAlignment write SetAlignment default taLeftJustify;
    { When true the column can be selected }
    property CanSelect: Boolean read FCanSelect write FCanSelect;
    { The column caption }
    property Caption: string read FCaption write SetCaption;
    { When true the column cannot be resized }
    property Fixed: Boolean read FFixed write SetFixed default False;
    { The smallest width the column can be resized to }
    property MinWidth: Integer read FMinWidth write SetMinWidth default 10;
    { The sort indicator shown in the column }
    property Sort: TSortingOrder read FSort write SetSort default soNone;
    { User defined data }
    property Tag: Integer read FTag write FTag;
    { Show or hide the column }
    property Visible: Boolean read FVisible write SetVisible default True;
    { The column width }
    property Width: Integer read FWidth write SetWidth default 100;
  end;