[lmikle]

Delphi XE3. Вот такой код работает как по кнопке, так и автоматически:

Код:

unit Unit1;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Vcl.Grids, Vcl.DBGrids,
  Data.DB, dxmdaset;

type
  TDBGrid = class(vcl.dbgrids.TDBGrid)
  private
    FColResize : TNotifyEvent;
  protected
    procedure ColWidthsChanged; override;
  public
    property OnColResize : TNotifyEvent read FColResize write FColResize;
  end;

  TForm1 = class(TForm)
    dxMemData1: TdxMemData;
    dxMemData1Field1: TStringField;
    dxMemData1Field2: TStringField;
    dxMemData1Field3: TStringField;
    DataSource1: TDataSource;
    DBGrid1: TDBGrid;
    StringGrid1: TStringGrid;
    btSyncColWidths: TButton;
    procedure FormCreate(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
    procedure btSyncColWidthsClick(Sender: TObject);
  private
    { Private declarations }
    procedure SyncColWoidths;
    procedure DBGridColResize(Sender : TObject);
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

{ TDBFrid }

procedure TDBGrid.ColWidthsChanged;
begin
  inherited;
  if Assigned(FColResize) then
    FColResize(Self);
end;

{ TForm1 }

procedure TForm1.btSyncColWidthsClick(Sender: TObject);
begin
  SyncColWoidths;
end;

procedure TForm1.DBGridColResize(Sender: TObject);
begin
  SyncColWoidths;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  dxMemData1.Active := True;
  dxMemData1.AppendRecord([1,'Rec1 Fld1','Rec1 Fld2','Rec1 Fld3']);
  dxMemData1.AppendRecord([2, 'Rec2 Fld1','Rec2 Fld2','Rec2 Fld3']);
  dxMemData1.AppendRecord([3, 'Rec3 Fld1','Rec3 Fld2','Rec3 Fld3']);
  SyncColWoidths;
  DBGrid1.OnColResize := DBGridColResize;
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
  dxMemData1.Active := False;
end;

procedure TForm1.SyncColWoidths;
var
  I : Integer;
begin
  for I := 0 to DBGrid1.Columns.Count-1 do
    StringGrid1.ColWidths[i] := DBGrid1.Columns[i].Width;
end;

end.