diff --git a/components/tooltip.lua b/components/tooltip.lua
index c3cbe91..ff822d2 100644
--- a/components/tooltip.lua
+++ b/components/tooltip.lua
@@ -10,7 +10,7 @@ game_tooltip_money = nil
 function LOAD()
     for func, hook in game_tooltip_hooks do
         local func, hook = func, hook
-        hook(
+        _m.hook(
             func,
             function(...)
                 hooked_setter = true
@@ -211,24 +211,23 @@ function game_tooltip_hooks:SetCraftItem(skill, slot)
     else
         link, quantity = GetCraftItemLink(skill), 1
     end
-    if link then extend_tooltip(GameTooltip, link, quantity) end
+    if link then
+	    extend_tooltip(GameTooltip, link, quantity)
+    end
 end
 
 function game_tooltip_hooks:SetCraftSpell(slot)
-    local link = GetCraftItemLink(slot)
-    if link then
-        extend_tooltip(GameTooltip, link, 1)
+    if x(GetCraftItemLink(slot)) then
+        extend_tooltip(GameTooltip, __, 1)
     end
 end
 
 function game_tooltip_hooks:SetTradeSkillItem(skill, slot)
     local link, quantity
     if slot then
-        link = GetTradeSkillReagentItemLink(skill, slot)
-        quantity = ({GetTradeSkillReagentInfo(skill, slot)})[3]
+        link, quantity = GetTradeSkillReagentItemLink(skill, slot), select(3, GetTradeSkillReagentInfo(skill, slot))
     else
-        link = GetTradeSkillItemLink(skill)
-        quantity = 1
+        link, quantity = GetTradeSkillItemLink(skill), 1
     end
     if link then
         extend_tooltip(GameTooltip, link, quantity)
@@ -236,11 +235,11 @@ function game_tooltip_hooks:SetTradeSkillItem(skill, slot)
 end
 
 function game_tooltip_hooks:SetAuctionSellItem()
-    local name, _, quantity, _, _, _ = GetAuctionSellItemInfo()
+    local name, _, quantity = GetAuctionSellItemInfo()
     if name then
         for slot in inventory do
             local link = GetContainerItemLink(unpack(slot))
-            if link and ({info.parse_link(link)})[5] == name then
+            if link and select(5, info.parse_link(link)) == name then
                 extend_tooltip(GameTooltip, link, quantity)
                 return
             end
diff --git a/core.lua b/core.lua
index 3a9b000..109c19c 100644
--- a/core.lua
+++ b/core.lua
@@ -9,8 +9,7 @@ function LOAD()
 		local frame = CreateFrame('Frame', gui.name, UIParent)
 		tinsert(UISpecialFrames, 'aux_frame1')
 		gui.set_window_style(frame)
-		frame:SetWidth(768)
-		frame:SetHeight(447)
+		gui.set_size(frame, 768, 447)
 		frame:SetPoint('LEFT', 100, 0)
 		frame:SetToplevel(true)
 		frame:SetMovable(true)
@@ -36,8 +35,7 @@ function LOAD()
 	do
 		local btn = gui.button(frame, 16)
 		btn:SetPoint('BOTTOMRIGHT', -6, 6)
-		btn:SetWidth(65)
-		btn:SetHeight(24)
+		gui.set_size(btn, 65, 24)
 		btn:SetText 'Close'
 		btn:SetScript('OnClick', L(frame.Hide, frame))
 		public.close_button = btn
@@ -45,8 +43,7 @@ function LOAD()
 	do
 		local btn = gui.button(frame, 16)
 		btn:SetPoint('RIGHT', close_button, 'LEFT' , -5, 0)
-		btn:SetWidth(65)
-		btn:SetHeight(24)
+		gui.set_size(btn, 65, 24)
 		btn:SetText 'Default UI'
 		btn:SetScript('OnClick',function()
 			if AuctionFrame:IsVisible() then HideUIPanel(AuctionFrame) else ShowUIPanel(AuctionFrame) end
diff --git a/gui.lua b/gui.lua
index 807662d..ebc3b17 100644
--- a/gui.lua
+++ b/gui.lua
@@ -524,8 +524,7 @@ end
 
 function public.item(parent)
     local item = CreateFrame('Frame', nil, parent)
-    item:SetWidth(260)
-    item:SetHeight(40)
+    set_size(item, 260, 40)
     local btn = CreateFrame('CheckButton', name, item, 'ActionButtonTemplate')
     item.button = btn
     btn:SetPoint('LEFT', 2, .5)
diff --git a/module.lua b/module.lua
index f74771f..0780265 100644
--- a/module.lua
+++ b/module.lua
@@ -1,15 +1,16 @@
 local type, setmetatable, setfenv, unpack, mask, _g = type, setmetatable, setfenv, unpack, bit.band, getfenv(0)
-local PRIVATE, PUBLIC, MUTABLE, PROPERTY, ACCESSOR, MUTATOR = 0, 1, 2, 4, 8, 16
+local PRIVATE, PUBLIC, MUTABLE, PROPERTY, ACCESSOR, MUTATOR, INITIALIZED = 0, 1, 2, 4, 8, 16, 32
 local MODIFIER = {private=PRIVATE, public=PUBLIC, mutable=MUTABLE, accessor=ACCESSOR+PROPERTY, mutator=MUTATOR+PROPERTY}
 local MODIFIER_MASK, PROPERTY_MASK = {private=MUTABLE+ACCESSOR+MUTATOR, public=MUTABLE+ACCESSOR+MUTATOR, mutable=PRIVATE+PUBLIC, accessor=PRIVATE+PUBLIC, mutator=PRIVATE+PUBLIC}, PRIVATE+PUBLIC
-local error, declaration_error, immutable_error, collision_error, void_error, set_property, lock_mt, env_mt, interface_mt, declarator_mt, importer_mt
-lock_mt = {}
-local _state, _modules = {}, setmetatable({}, lock_mt)
-function error(message, level, ...) _g.error(format(message, unpack(arg))..'\n'..debugstack(3, 5, 0), (level or 1) + 1) end
-function declaration_error(level) error('Malformed declaration.', level + 1) end
-function immutable_error(key, level) error('Field "%s" is immutable.', level + 1, key) end
-function collision_error(key, level) error('Field "%s" already exists.', level + 1, key) end
-function void_error(key, level) error('No field "%s".', level + 1, key) end
+local error, modifier_error, property_error, immutable_error, collision_error, null_error, set_property, env_mt, interface_mt, declarator_mt, importer_mt
+local _state, _modules = {}, {}
+local NULL = setmetatable({}, {__metatable=false, __index=error'NULL', __newindex=error'NULL'})
+function error(message, ...) return function() _g.error(format(message, unpack(arg))..'\n'..debugstack(3, 10, 0)) end end
+modifier_error = error 'Invalid modifiers.'
+property_error = error 'Accessor/Mutator must be function.'
+function immutable_error(key) return error('Field "%s" is immutable.', key) end
+function collision_error(key) return error('Field "%s" already exists.', key) end
+function null_error(key) error('No field "%s".', key) end
 importer_mt = {__metatable=false}
 function importer_mt.__index(self, key) _state[self][self] = key; return self end
 function importer_mt.__call(self, arg1, arg2)
@@ -31,7 +32,7 @@ function importer_mt.__call(self, arg1, arg2)
 	return self
 end
 function set_property(data, property, value)
-	if property and not data[property] and type(value) == 'function' or declaration_error(2) then
+	if property and not data[property] and type(value) == 'function' or property_error() then
 		data[property] = value
 	end
 end
@@ -39,20 +40,20 @@ declarator_mt = {__metatable=false}
 function declarator_mt.__index(self, key)
 	local state, modifier = _state[self], MODIFIER[key]; local modifiers = state.modifiers
 	if modifier then
-		if mask(MODIFIER_MASK[key], modifiers) ~= modifiers then declaration_error(2) end
+		if mask(MODIFIER_MASK[key], modifiers) ~= modifiers then modifier_error() end
 		state.modifiers = modifiers + modifier; return self
-	elseif not state.metadata[key] or collision_error(key, 2) then
-		if mask(PROPERTY_MASK, modifiers) ~= modifiers then declaration_error(2) end
+	elseif not state.metadata[key] or collision_error(key) then
+		if mask(PROPERTY_MASK, modifiers) ~= modifiers then modifier_error() end
 		state.property, state.metadata[key], state.modifiers = key, modifiers + PROPERTY, PRIVATE
 	end
 end
 function declarator_mt.__newindex(self, key, value)
 	local state = _state[self]
-	if state.metadata[key] then collision_error(key, 2) end
+	if state.metadata[key] then collision_error(key) end
 	state.metadata[key] = state.modifiers
 	if mask(PROPERTY, state.modifiers) == 0 then
 		state.data[key] = value
-	elseif type(value) == 'function' or declaration_error(2) then
+	elseif type(value) == 'function' or property_error() then
 		local data = mask(ACCESSOR, state.modifiers) ~= 0 and state.accessors or state.mutators
 		state.property, data[key] = key, value
 	end
@@ -67,7 +68,7 @@ do
 				return state.data[key]
 			else
 				local accessor = state.accessors[key]
-				if accessor then return accessor() else return default[key] or void_error(key, 2) end
+				if accessor then return accessor() else return default[key] or null_error(key) end
 			end
 		end
 	end
@@ -77,7 +78,7 @@ do
 		if modifiers then
 			local mutator = state.mutators[key]
 			if mutator then return mutator(value) end
-			if mask(MUTABLE, modifiers) == 0 then immutable_error(key, 2) end
+			if mask(MUTABLE, modifiers) == 0 then immutable_error(key) end
 		else
 			state.metadata[key] = state.modifiers
 		end
@@ -85,10 +86,10 @@ do
 	end
 	interface_mt = {__metatable=false, __index=index(PUBLIC, {})}
 	function interface_mt.__newindex(self, key, value)
-		local state = _state[self]; local metadata = state.metadata or void_error(key, 2)
+		local state = _state[self]; local metadata = state.metadata or null_error(key)
 		if mask(PUBLIC+MUTATOR, metadata) == PUBLIC+MUTATOR then
 			return state.mutators[key](value)
-		elseif mask(PUBLIC, metadata) == PUBLIC or immutable_error(key, 2) then
+		elseif mask(PUBLIC, metadata) == PUBLIC or immutable_error(key) then
 			state.data[key] = value
 		end
 	end
@@ -105,13 +106,11 @@ function module(name)
 		mutators = {accessor=function(value) set_property(accessors, state.property, value) end, mutator=function(value) set_property(mutators, state.property, value) end}
 		state = {
 			env=env, interface=interface, modifiers=PRIVATE,
-			metadata = setmetatable({_g=PRIVATE, _m=PRIVATE, _i=PRIVATE, import=PRIVATE, private=PROPERTY+ACCESSOR, public=PROPERTY+ACCESSOR, mutable=PROPERTY+ACCESSOR, accessor=PROPERTY+ACCESSOR+MUTATOR, mutator=PROPERTY+ACCESSOR+MUTATOR}, lock_mt),
-			data = {_g=_g, _m=env, _i=interface, import=importer}, accessors=accessors, mutators=mutators,
+			metadata = {NULL=PRIVATE, _g=PRIVATE, _m=PRIVATE, _i=PRIVATE, import=PRIVATE, private=PROPERTY+ACCESSOR, public=PROPERTY+ACCESSOR, mutable=PROPERTY+ACCESSOR, accessor=PROPERTY+ACCESSOR+MUTATOR, mutator=PROPERTY+ACCESSOR+MUTATOR},
+			data = {NULL=NULL, _g=_g, _m=env, _i=interface, import=importer}, accessors=accessors, mutators=mutators,
 		}
 		_modules[name], _state[env], _state[interface], _state[declarator], _state[importer] = state, state, state, state, state
 		setfenv(INIT, env); INIT()
 	end
 	setfenv(2, _modules[name].env)
-end
-local frame = CreateFrame 'Frame'; frame:RegisterEvent 'PLAYER_LOGIN'
-frame:SetScript('OnEvent', function() lock_mt.__newindex = function() error 'Modules are frozen after the loading phase.' end end)
\ No newline at end of file
+end
\ No newline at end of file
diff --git a/tables/auction_listing.lua b/tables/auction_listing.lua
index 629f9ce..92df3d9 100644
--- a/tables/auction_listing.lua
+++ b/tables/auction_listing.lua
@@ -1,4 +1,4 @@
-module 'auction_listing'
+module 'auction_listing' import 'gui'
 
 _g.aux_price_per_unit = false
 
diff --git a/tabs/auctions/frames.lua b/tabs/auctions/frames.lua
index b5b30a2..533f8b9 100644
--- a/tabs/auctions/frames.lua
+++ b/tabs/auctions/frames.lua
@@ -1,4 +1,4 @@
-module 'auctions_tab'
+module 'auctions_tab' import 'gui'
 
 function create_frames()
 	frame = CreateFrame('Frame', nil, frame)
diff --git a/tabs/bids/frames.lua b/tabs/bids/frames.lua
index 2f51b0a..056e041 100644
--- a/tabs/bids/frames.lua
+++ b/tabs/bids/frames.lua
@@ -1,4 +1,4 @@
-module 'bids_tab'
+module 'bids_tab' import 'gui'
 
 function create_frames()
 	frame = CreateFrame('Frame', nil, frame)
diff --git a/tabs/post/frames.lua b/tabs/post/frames.lua
index dae97d1..122b953 100644
--- a/tabs/post/frames.lua
+++ b/tabs/post/frames.lua
@@ -1,4 +1,4 @@
-module 'post_tab'
+module 'post_tab' import 'gui'
 
 function create_frames()
 	frame = CreateFrame('Frame', nil, frame)
diff --git a/tabs/search/frames.lua b/tabs/search/frames.lua
index 8d1dc20..5afbf2e 100644
--- a/tabs/search/frames.lua
+++ b/tabs/search/frames.lua
@@ -1,4 +1,4 @@
-module 'search_tab'
+module 'search_tab' import 'gui'
 
 FILTER_SPACING = 28.5