I have a "little" problem with nestedHeaders..
i have this code...
nestedHeaders: [
['SEMANA', 'DIA', 'FECHA', {label: 'Semana 1', colspan: 5}, 'B'],
['1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12', '13', '14', '15', '16', '17', '18', '19']
],
and show this...