>I used to know this by heart but I forgot all the necessary steps. I know I have it in a book somewhere but still I wanted to ask here because I'm sure it'll be an easy reply for a lot of developers here.
>
>So I have a form with a bunch of textboxes for example. I want to change the class of that textbox without having to remove those textboxes from my form and adding the one from the new wanted class.
>
>Instead of me hacking manually the required objects do you know if someone developed a tool to do that hacking faster?

I know of no explicit tool

but

USE your_frx

replace CLASS with ctargett FOR CLASS=='OldCLASS' and BASECLASS='TEXTBOX' 
use
compile classlib your_frx

is fast enough