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type
  TMeinSG = class(TStringGrid);

procedure TMain.Button1Click(Sender: TObject);
var i: integer;
begin
  for i := 1 to StrinGrid1.RowCount do
    begin
      if pos(ED_Suche.Text, StrinGrid1.Cells[1,i]) = 0 then DeleteRow(i);
    end;
end;

procedure TMain.DeleteRow(ARow: Integer);
begin
  with TMeinSG(StrinGrid1) do
    DeleteRow(ARow);
end;                    

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type
    THackGrid=Class(TCustomGrid)
      procedure DeleteRow(ARow: Longint);
    end;
{ THackGrid }
procedure THackGrid.DeleteRow(ARow: Integer);
begin
   inherited;
end;


Procedure DeleteRow(sg:TStringGrid;Index:Integer);
begin
  THackGrid(sg).DeleteRow(index);
end;

procedure TForm1.Button1Click(Sender: TObject);
var i: integer;
begin
  for i := StringGrid1.RowCount - 1 DownTo 1 do
    begin
      if pos(ED_Suche.Text, StringGrid1.Cells[1,i]) = 1 then DeleteRow(StringGrid1,i);
    end;
end;




procedure TForm1.FormCreate(Sender: TObject);
begin
  ReportMemoryLeaksOnShutDown := true;
end;