The following example demonstrates tracking the mouse movements in a StringGrid component. If the mouse moves to a different cell in the grid, a new hint window is displayed, showing the row and column numbers of the cell. Example:

type
  TForm  = class(TForm)
    StringGrid : TStringGrid;
    procedure StringGrid MouseMove(Sender: TObject;
      Shift: TShiftState; X, Y: Integer);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
      Col : integer;
      Row : integer;
  public
    { Public declarations }
  end;
var
  Form : TForm ;
implementation
{$R *.DFM}
procedure TForm .FormCreate(Sender: TObject);
begin
  StringGrid .Hint := '0 0';
  StringGrid .ShowHint := True;
end;
procedure TForm .StringGrid MouseMove(Sender: TObject;
Shift: TShiftState; X, Y: Integer);
var
  r : integer;
  c : integer;
begin
  StringGrid .MouseToCell(X, Y, C, R);
  if ((Row <> r) or
      (Col <> c)) then begin
    Row := r;
    Col := c;
    Application.CancelHint;
    StringGrid .Hint := IntToStr(r) + #32 + IntToStr(c);
  end;
end;