unit Unit1;

interface

uses
  System.SysUtils, System.Types, System.UITypes, System.Rtti, System.Classes,
  System.Variants, FMX.Types, FMX.Controls, FMX.Forms, FMX.Dialogs, FMX.Types3D,
  FMX.Objects3D;

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    FCubeArray: array[1..1000] of TCube;
    procedure CubeClick(Sender: TObject);
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.fmx}

procedure TForm1.Button1Click(Sender: TObject);
var
  I: Integer;
begin
  for I := Low(FCubeArray) to High(FCubeArray) do
  begin
    FCubeArray[I] := TCube.Create(Self);
    // setup whatever else...
    FCubeArray[I].Name := 'Cube' + IntToStr(I);
    // and here you assign your private CubeClick method to the
    // OnClick event for each cube you create
    FCubeArray[I].OnClick := CubeClick;
  end;
end;

procedure TForm1.CubeClick(Sender: TObject);
begin
  // TCube(Sender).Position.X and whatever else
  ShowMessage(TCube(Sender).Name);
end;

end.