for(int i = 0; i < childCount(); i++) {
categoryItem = qobject_cast<UserCategoryItem *>(child(i));
categoryItem->removeChildById((quint64)ircUser);
for(int i = 0; i < childCount(); i++) {
categoryItem = qobject_cast<UserCategoryItem *>(child(i));
categoryItem->removeChildById((quint64)ircUser);