Read this article
http://www.inogic.com/blog/2012/06/how-to-debug-plugins-using-profiler/
http://www.inogic.com/blog/2012/06/how-to-debug-plugins-using-profiler/
Recently I have faced a scenario to numbering parent group and subgroup in the following formate 10 parentGroupRow1 10.1 childGroupRow1 ...