protected override Backtrace OnGetThreadBacktrace(long processId, long threadId)
{
ResultData data = SelectThread (threadId);
var res = debugger.Backtrace (new BackTraceRequestArguments ());
int fcount = res.Frames.Length;
NodeBacktrace bt = new NodeBacktrace (this, threadId, fcount, data != null ? data.GetObject ("frame") : null);
return new Backtrace (bt);
}