for (size_t i = 0; i < content.size(); ++i) {
if (find(cl.begin(), cl.end(), content[i]) != cl.end()) {
_content->SetItemState (i, wxLIST_STATE_SELECTED, wxLIST_STATE_SELECTED);
for (size_t i = 0; i < content.size(); ++i) {
if (find(cl.begin(), cl.end(), content[i]) != cl.end()) {
_content->SetItemState (i, wxLIST_STATE_SELECTED, wxLIST_STATE_SELECTED);