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uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, Grids, DBGrids, DB, ADODB;

type
  TDBGrid=Class(DBGrids.TDBgrid)
    Property Row;
    Property TopRow;
  End;
  TForm3 = class(TForm)
    ADOConnection1: TADOConnection;
    ADODataSet1: TADODataSet;
    DataSource1: TDataSource;
    DBGrid1: TDBGrid;
    procedure DBGrid1MouseMove(Sender: TObject; Shift: TShiftState; X,
      Y: Integer);
  private
    { Private-Deklarationen }
    FGCoord:TGridCoord;
  public
    { Public-Deklarationen }
  end;

var
  Form3: TForm3;

implementation
uses Math;
{$R *.dfm}

procedure TForm3.DBGrid1MouseMove(Sender: TObject; Shift: TShiftState; X,
  Y: Integer);
  var
   COOrd:TGridCoord;
begin
   COOrd :=DBGrid1.MouseCoord(X,y) ;
   if ((COOrd.X>-1) and (COOrd.Y>0)) and ((COOrd.X<>FGCoord.X) or (COOrd.Y<>FGCoord.Y)) then
      begin
          // hier finde ich nichts brauchbares um Satz / Anzeige und Maus zu synchronisieren
          AdoDataset1.RecNo :=  COOrd.Y+ DBGrid1.Toprow;

          DBgrid1.Hint := '';
          if DBgrid1.Columns[COOrd.X-1].Field.FieldName='Field5' then
            begin
               DBgrid1.Hint := DBgrid1.Columns[COOrd.X].Field.asString;
               Application.ActivateHint(DBGrid1.ClientToScreen( Point(X,y)));
            end;

      end
      else
        begin
        Application.CancelHint;
        end;
end;

end.