for all examples you just don't need to open the .xml backup only.
you must:
1 - load project where the .xml backup is (load project)
2- load the .xml backup (Open .xml backup).

as this part of process it works; but if no :

3- save it as preset (save as).
4- close HISE.
5- reopen HISE and load your preset (open file from project)

and now it works 100% with interface. ;)

the interface problem is due to fact that we didn't load the project first - as the projects contain scripts and images (and more) that must be read.