Thanx for the quick response.
It looks like the first time file is loaded in the control, it does not let you insert/remove rows. But when second time page is loaded you can do the insert/remove functionality.
I think it has something to do with the 'clean up HTML', as after page is loaded the first time I clean up the HTML and then post it back. And this time around it works fine.

But not a big issue, though I have another question:

How can I remove the 'toolbox sections' like all the HTML related stuff like textarea, form, checkbox etc. ?

-Jasim