TAB-navigation misbehaviour

[MarKeP]

TAB-navigation misbehaves in "Authentication keys" tab in "Veyon Configurator".

I'll highly recommend trying on your own - so you know exactly what I'm trying to describe.
Selection cursor happens to be stuck in list "Available authentication keys" list not responding to Ctrl + Tab shortcut to switch group of control buttons.
Its a trap that makes setting Veyon up without mouse attached virtually impossible.

Thanks in advance
Plachy