Control Tab of Fields

Check the following article:

http://www.webcheatsheet.com/html/controll_tab_order.php

I know I can use tabindex to control the tab order. However, how can I change the template or using visual editor to include the taborder tag? The template has its own syntax and language like "{build_edit_control field="Client_First_Name" mode="add" value=$value_Client_First_Name}". How can I override this syntax to include tabindex?
Chris.

Chris,
this is not possible without generated code modification.

Thanks. Where can I modify the generated code? It seems the control is generated on the fly. I can't insert the tabindex in the html file created.
Chris.

Chris,
check BuildEditControl function in include/commonfunctions.asp file.