[votan]

@Chip: Found them:
One in keyboard and the other one (with UI_SHORTCUT_NEGATIVE) in gamepad:

function ZO_DyeStamp_Confirmation_Base:AddExitKey()
    -- Special exit button
    exit = 
    {
        alignment = KEYBIND_STRIP_ALIGN_RIGHT,
        name = GetString(SI_EXIT_BUTTON),
        keybind = "UI_SHORTCUT_EXIT",
        callback = function() self:EndConfirmation() end,
    }
    table.insert(self.keybindStripDescriptor, exit)
end

function ZO_ActivityFinderTemplate_Keyboard:RefreshFilters()
...
                local minGroupSize, maxGroupSize = ZO_ACTIVITY_FINDER_ROOT_MANAGER:GetGroupSizeRangeForActivityType(activityType)
                level = true
                rank = true
                local entry = ZO_ComboBox:CreateItemEntry(activityName, OnFilterChanged)
...