Multipage box with caption

[Frank Leone]

Dear all,

I am writing my PhD-thesis in LyX 2.1 and use a multipage box in my
introduction. I would like to add a caption to the box. I know that
normally can be done by putting a float around it, but as it is a multipage
box, this is not possible.

Does someone have an idea what I could do to get a caption to a multipage
box?

Thanks a lot in advance,

         best,

                Frank