It doesn't work either.
I have double checked everything again and again but I am not able to see any outputs even if I add a :
to manually initialize the frame as you suggest.
If I have understood your post, the scrollframe should be the parent frame that will contain the inner scroll child... And so I need another frame to contain all the other things I wanna to be scrolled ...
But here I really don't understand where is this second frame, where I could add, in example, the buttons.
I am sorry if it is a silly question, but I am really lost now :-)
Thanks again for you replies.