Racial Special removal - when?

[wrs92103]

When (what phase and priority) do Alternative Racial Traits remove racial specials?

I created a Gnome character, who naturally gets Low-Light vision (raLowLight). I chose the Darkvision alternative racial trait, which replaces it with Darkvision (via RaReplace.raLowLight). I want to give this character the Blood of Dragons racial trait, and have this trait re-add low light.

My GM agrees that this should result in a character that has both Low-Light and Darkvision. Unfortunately the character sheet disagrees.

I _think_ what's going on is that the sequencing is off; both the race and bloodline trait add raLowLight, then the RaReplace comes in and blows them both away.

My thought is to make a custom version of Blood of Dragons that tries to add the raLowLight tag later, so that it's added after RaReplace happens. Anyone know when that would be?