Jayakumar Sudhaharan, I have not used ad_form yet, so cannot confirm this, but..
In reading the referenced page, there is this one sentence:
This example includes dummy redirects to a script named "somewhere" to make clear the fact that after executing the new_data or edit_data block ad_form returns to the caller.
It seems to me that this "somewhere", in the example code, is the place to make the redirect. How it is done (whether as a procedure in the same file, or a url reference), I don't know yet --and would like to see a working example... maybe can be found by grepping the tcl files for ad_form???