ApiTraceEvent *event = item(parent);
if (event && event->type() == ApiTraceEvent::Frame) {
ApiTraceFrame *frame = static_cast<ApiTraceFrame*>(event);
ApiTraceEvent *event = item(parent);
if (event && event->type() == ApiTraceEvent::Frame) {
ApiTraceFrame *frame = static_cast<ApiTraceFrame*>(event);