Reference TSplitter

  TSplitter = class(TChangeNotifier)
  public
    { Create a new splitter }
    constructor Create;
    { Assign the object from a source }
    procedure Assign(Source: TPersistent); override;
  published
    { The control can be resized with the mouse }
    property Enabled: Boolean read FEnabled write SetEnabled default False;
    { The minimum size the control can be resized to with the mouse }
    property MinSize: Integer read FMinSize write SetMinSize default 10;
    { The minimum space remaining in the parent control }
    property MinRemain: Integer read FMinRemain write SetMinRemain default 10;
    { When visible is true child controls are arranged to not occupy the
      splitter area }
    property Visible: Boolean read FVisible write SetVisible default True;
    { The size of the splitter area when visible }
    property Margin: Integer read FMargin write SetMargin default 4;
  end;