Hide MicroBars Mouseover / Achievement Button

[laukond]

I use this script to hide the micromenu when now mouseovered:

local function showFoo(self)
	for _, v in ipairs(MICRO_BUTTONS) do
		_G[v]:SetAlpha(1)
	end
end

local function hideFoo(self)
	for _, v in ipairs(MICRO_BUTTONS) do
		_G[v]:SetAlpha(0)
	end
end

for _, v in ipairs(MICRO_BUTTONS) do
	v = _G[v]
	v:HookScript("OnEnter", showFoo)
	v:HookScript("OnLeave", hideFoo)
	v:SetAlpha(0)
end

My problem is that the achievement button doesn't hide on login, I need to hover it once for it to fade:
http://i.imgur.com/h18nkpF.jpg

How do I make the achievement button fade on login like the rest of the micromenu buttons?