...herausfinden, wenn eine Form minimiert oder maximiert wird?

  private
    { Private declarations }
    procedure WMSyscommand(var msg: TWmSysCommand); message WM_SYSCOMMAND;
    procedure WMSize( Var msg: TWMSize ); Message WM_SIZE;
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.WMSyscommand(var msg: TWmSysCommand);
begin
   case (msg.CmdType and $FFF0) of
     SC_MINIMIZE: begin
                    ShowMessage('Window about to MINIMIZE');
                  end;
     SC_RESTORE : begin
                    ShowMessage('Window about to RESTORE');
                  end;
     SC_MAXIMIZE: begin
                    ShowMessage('Window about to MAXIMIZE');
                  end;
   end;
   inherited;
end;

procedure TForm1.WMSize(var msg: TWMSize);
begin
  If msg.Sizetype = SIZE_MAXIMIZED then
    ShowMessage('Window MAXIMIZED');
  inherited;
end;

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