Time region selection problem

Profiler

Hi,

When I tried to select a time region, the source codes (for that selected time region) weren't displayed.

For example:
1. I have a code that read from a large file (about 1 GB file).
2. After reading file is completed, then I start manipulating the data (which can take about an hour).
3. When I select the "time region" on data manipulation, the critical code still on "reading from file".

I need to profile "data manipulation" codes and NOT on "reading".
How can I achieve that?

Thanks,
Sam