const vector< shared_ptr<Trace> > traces(_view.get_traces());
BOOST_FOREACH(shared_ptr<Trace> t, traces) {
assert(t);
const vector< shared_ptr<Trace> > traces(_view.get_traces());
BOOST_FOREACH(shared_ptr<Trace> t, traces) {
assert(t);
BOOST_FOREACH(shared_ptr<Trace> t, traces) {
assert(t);
connect(t.get(), SIGNAL(visibility_changed()),
BOOST_FOREACH(shared_ptr<Trace> t, traces) {
assert(t);
connect(t.get(), SIGNAL(visibility_changed()),