From
Blizzard_EncounterJournal.lua
Lua Code:
infoHeader = CreateFrame("FRAME", "EncounterJournalOverviewInfoHeader"..index, EncounterJournal.encounter.overviewFrame, "EncounterInfoTemplate");
The header inherits
EncounterInfoTemplate which is in
Blizzard_EncounterJournal.xml
You might have to use
GetChildren/GetRegions if the what you're looking for doesn't have a parentKey associated.