diff --git a/itemcontroller.lua b/itemcontroller.lua
index 5c4a778..b655d7c 100644
--- a/itemcontroller.lua
+++ b/itemcontroller.lua
@@ -249,12 +249,16 @@ local PAGES = {
       id = "action_sort"
     }
 
-    local function tabActionButton(count)
-      local text = count < 0 and ("<"..tostring(-count)) or (tostring(count)..">")
-      return Text:new{ id = tostring(count), text = text }
+    local function tabActionButtonID(value)
+      return value < 0 and ("<"..tostring(-value)) or (tostring(value)..">")
     end
 
-    local function tabActionButtonID(index, interval, count, sign)
+    local function tabActionButton(count)
+      local text = tabActionButtonID(count)
+      return Text:new{ id = text, text = text }
+    end
+
+    local function tabActionButtonValue(index, interval, count, sign)
       --             | s = 1: i - 1
       -- k(i, c, s) <|
       --             | s = -1: c - i
@@ -284,10 +288,10 @@ local PAGES = {
     local function tabActionList(interval, count, sign, spacing)
       local buttons = {}
       if count > 0 then
-        table.insert(buttons, tabActionButton(tabActionButtonID(1, interval, count, sign)))
+        table.insert(buttons, tabActionButton(tabActionButtonID(tabActionButtonValue(1, interval, count, sign))))
         for i=2,count do
           table.insert(buttons, Element:new{ width = spacing })
-          table.insert(buttons, tabActionButton(tabActionButtonID(i, interval, count, sign)))
+          table.insert(buttons, tabActionButton(tabActionButtonID(tabActionButtonValue(i, interval, count, sign))))
         end
       end
 
@@ -560,12 +564,12 @@ local PAGES = {
         end
       end
       for i=1,ACTION_COUNT do
-        local id = tabActionButtonID(i, ACTION_INTERVAL, ACTION_COUNT, 1)
-        bottomBarList:findById(tostring(id)):setOnClick(onClickHandler(id))
+        local value = tabActionButtonValue(i, ACTION_INTERVAL, ACTION_COUNT, 1)
+        bottomBarList:findById(tabActionButtonID(value)):setOnClick(onClickHandler(value))
       end
       for i=1,ACTION_COUNT do
-        local id = tabActionButtonID(i, ACTION_INTERVAL, ACTION_COUNT, -1)
-        bottomBarList:findById(tostring(id)):setOnClick(onClickHandler(id))
+        local value = tabActionButtonValue(i, ACTION_INTERVAL, ACTION_COUNT, -1)
+        bottomBarList:findById(tabActionButtonID(value)):setOnClick(onClickHandler(value))
       end
     end
     bindTabActionButtons()