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unit Unit1;

interface

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

type
  TForm1 = class(TForm)
  private
        procedure WMPosChange(var Msg:TWMWindowPosChanged); message WM_WINDOWPOSCHANGING;

  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

{ TForm1 }

procedure TForm1.WMPosChange(var Msg: TWMWindowPosChanged);
begin
  msg.WindowPos.hwndInsertAfter := HWND_BOTTOM;
end;