ArrayCtrl ac;
...
Ctrl* p = new Option();
p->WhenAction = THISBACK(OnAction);
SetCtrl(k, 1, p);
++k;
...
p = new EditInt();
p->WhenAction = THISBACK(OnAction);
ac.SetCtrl(k, 1, p);
...
void MyClass::OnAction()
{
   DoWork(ac.Get(0), ac.Get(1));
}