Dynamic header line for each table row.

[fbobss]

I have a table with 30 columns. I will show on the Adobe Layout only the used columns for each row with different used columns and will print a new header line for each row.
I used the event initialize and it is working for the first row (11 columns). But the second header is showing again 11 columns independant of number of used columns.
Looks to me the event initialize will be processed only 1 time.
Any idea if I can use a different event to fulfil my requirements or maybe any other thouhts how I can solve?
Thank you.