Reference TAdvancedColorDialogForm

  TAdvancedColorDialogForm = class(TForm)
  protected
    procedure DoShow; override;
  public
    { Create the dialog form and its controls }
    constructor Create(AOwner: TComponent); override;
    { Load the custom colors from CustomColorsFile }
    procedure LoadCustomColors;
    { Save the custom colors to CustomColorsFile }
    procedure SaveCustomColors;
    { The selected color including alpha. Setting it also sets the original
      color shown in the preview. }
    property ColorValue: TColorB read FColor write SetColorValue;
    { The file where custom colors are saved. When empty a file named
      customcolors.txt in the application config directory is used. }
    property CustomColorsFile: string read GetCustomColorsFile write FCustomColorsFile;
  end;