Delphi - How do you resolve a conflict when a unit name is the same as a property name?

Question

The trivial example below is a condensation of a problem I had trying to resolve a conflict where I had an enumerated type member with the same name as a VCL member.

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs;

type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

type
    TSomeType = (
      alNone,
      alSome,
      alMany) ;

procedure TForm1.FormCreate(Sender: TObject);
begin
Self.Align := alNone ;                    // 1.  type mismatch
Self.Align := Controls.alNone ;           // 2.  "Controls" is also a property of TForm
end ;

end.

• The first assignment fails because the compiler thinks alNone is the one I declared and not the TAlign member defined in Controls.pas.
• The second one fails because it took Controls to mean the TForm property of that name.

I realise there are ways around this (renaming the alNone member being the simplest), but I'm curious as to whether there is a way of qualifying a reference to a property in another unit where the unit name conflicts with an identifier in the current scope.

Answer 1

Qualify it with the type name:

TAlign.alNone

I had not realised when I wrote this that the compiler version was relevant. This syntax only became available in Delphi 2010 or XE. There the answer is not appropriate for the tagged version, Delphi 2007. Deltics answer covers much more detail.