If you realy like, I have a builder that can change classes for objects in a container. I think similiar tith the Thor solution. It's a hackers tool, but works. Anyway, I think REPLACE is the better solution for your problem.

>Thank you Lutz.
>
>>>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