thisform.combo2.RowSourceType= 3
thisform.combo2.RowSource= " select instructor.codprof, instructor.nombre;
from actividad, deporte, instructor;
where actividad.coddep = deporte.coddep and;
actividad.codprof = instructor.codprof and;
deporte.coddep = VAL(thisform.combo1.value);
group by instructor.codprof, instructor.nombre;
into cursor combo2 "