While migrating from FMX to FNC components we replaced a TTMSFMXRating inside an TStyleBook with its FNC counterpart, but at runtime, at form creation, encontered the exception Class TTMSFNCRating not found.
We tried adding a TTMSFNCRating outside the stylebook, in the same form thinking it was a initialization problem but the result was the same. After inspecting the source of this component we noticed that this particular class lacks a RegisterRuntimeClasses procedure which is present on other FNC classes, so we added the override:
procedure RegisterRuntimeClasses; override;
And the implementation:
inherited;
RegisterClass(TTMSFNCRating);
Which, after recompiling the runtime package, effectively solved the problem, but it would be awesome if this is included in a eventual update for TMS FNC UI Pack.