delete rows created dynamically in dataTable using fnOpen

I am creating a new dataTable(child) inside a dataTable(parent) by creating new row to dataTable(Parent), Using fnOpen(indexOfRow,oTable,cssClass);
When i m closing this table , I am just destroing the dataTable(child),It is destroying! but after destroing the dataTable(child), I am left with The row created at 'indexOfRow'.
I want to get rid of this row which was housing the child datatable !!

Thanks