diff --git a/examples/menus/inventory/init.lua b/examples/menus/inventory/init.lua
index 9131acb..a41d003 100644
--- a/examples/menus/inventory/init.lua
+++ b/examples/menus/inventory/init.lua
@@ -49,11 +49,10 @@ function Inventory:new()
   self:addItem("shield", 2)
   self:addItem("shield", 1)
 
-  self.menusystem.menus["main"].isLocked = true
+  self.menusystem:lockMenu("main")
 
   self.menusystem:switchMenu("main")
-  self.menusystem.menus["weapon"].isVisible = true
-  self.menusystem.menus["weapon"].isActive  = true
+  self.menusystem:setMenuActivity("weapon", true)
 end
 
 -- MENU FUNCTION
diff --git a/gamecore/modules/menusystem/init.lua b/gamecore/modules/menusystem/init.lua
index aae8c54..0e67dd1 100644
--- a/gamecore/modules/menusystem/init.lua
+++ b/gamecore/modules/menusystem/init.lua
@@ -26,6 +26,10 @@ function MenuSystem:addMenu(name, menu)
   self.menus[name] = menu
 end
 
+function MenuSystem:menuExist(name)
+  return (self.menus[name] ~= nil)
+end
+
 function MenuSystem:update(dt)
   self:removeDestroyedMenus()
   for k,v in pairs(self.menus) do
@@ -59,6 +63,38 @@ function MenuSystem:switchMenu(menu)
   end
 end
 
+function MenuSystem:lockMenu(menu, lock)
+  local lock = lock or true
+  if self:menuExist(menu) then
+    self.menus[menu]:lock(lock)
+  end
+end
+
+function MenuSystem:lockMenuVisibility(menu, lock)
+  local lock = lock or true
+  if self:menuExist(menu) then
+    self.menus[menu]:lockVisibility(lock)
+  end
+end
+
+function MenuSystem:setMenuActivity(menu, activity)
+  local activity = activity or true
+  if self:menuExist(menu) then
+    self.menus[menu]:setActivity(activity)
+    if activity == true then
+      -- if we make the menu active, he have to be visible too
+      self.menus[menu]:setVisibility(true)
+    end
+  end
+end
+
+function MenuSystem:setMenuVisibility(menu, visibility)
+  local visibility = visibility or true
+  if self:menuExist(menu) then
+    self.menus[menu]:setVisibility(visibility)
+  end
+end
+
 function MenuSystem:setAllMenuVisibility(visibility)
   for k,v in pairs(self.menus) do
     v:setVisibility(visibility)
diff --git a/gamecore/modules/menusystem/parent.lua b/gamecore/modules/menusystem/parent.lua
index 2c0e71e..8581e34 100644
--- a/gamecore/modules/menusystem/parent.lua
+++ b/gamecore/modules/menusystem/parent.lua
@@ -53,6 +53,14 @@ function Menu:setActivity(activity)
   end
 end
 
+function Menu:lock(lock)
+  self.isLocked = lock
+end
+
+function Menu:lockVisibility(lock)
+  self.isAlwaysVisible = lock
+end
+
 function Menu:getFocus()
   self.menusystem.focusedMenu = self.name
 end