Modding a building with two-page interface

I am using Advanced Genie Editor and currently trying to create a copy of a Krepost and give it a second page of units (like the docks). I have so far been unable to do it as the second page just doesn’t show up. The unit’s train button is, of course, numbered to appear on the second page (i.e. 21). I tried changing the interface to match that of the dock (i.e. 2, it was originally 10) but to no avail. Anyone’s got any idea regarding how to do it?

Second train page is hardcoded to the dock ID. Nothing that can be done about it.

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Thanks for letting me know.