[ecfisa]

Hola FideRosado.

Código Delphi [-]
function ActiveCheckBoxes(SB: TScrollBox): Integer;
var
  i,j: Integer;
begin
  Result := 0;
  for i:= 0 to SB.ControlCount - 1 do
    if SB.Controls[i] is TPanel then
      for j:= 0 to TPanel(SB.Controls[i]).ControlCount-1 do
        if TPanel(SB.Controls[i]).Controls[j] is TCheckBox then
          Inc(Result, Integer(TCheckBox(TPanel(SB.Controls[i]).Controls[j]).Checked))
end;

Un ejemplo de uso:

Código Delphi [-]
procedure TForm1.Button1Click(Sender: TObject);
var
  n: Integer;
begin
  n := ActiveCheckBoxes(ScrollBox1);
  if n > 0 then
    ShowMessage(Format('Hay %d casillas marcadas',[n]))
end;

Saludos