diff --git a/res/layouts/pages/settings-audio.xml b/res/layouts/pages/settings-audio.xml
index 27fd4097..61f3ee89 100644
--- a/res/layouts/pages/settings-audio.xml
+++ b/res/layouts/pages/settings-audio.xml
@@ -1,23 +1,6 @@
 <panel size='400' color='0' interval='1'>
-    <label id='l_master'>-</label>
-    <trackbar min='0' max='1' value='1' step='0.01' track-width='5' 
-        consumer='on_master_change'
-        supplier='core.get_setting("audio.volume-master")'/>
-    <label id='l_regular'>-</label>
-    <trackbar min='0' max='1' value='1' step='0.01' track-width='5' 
-        consumer='on_regular_change'
-        supplier='core.get_setting("audio.volume-regular")'/>
-    <label id='l_ui'>-</label>
-    <trackbar min='0' max='1' value='1' step='0.01' track-width='5' 
-        consumer='on_ui_change'
-        supplier='core.get_setting("audio.volume-ui")'/>
-    <label id='l_ambient'>-</label>
-    <trackbar min='0' max='1' value='1' step='0.01' track-width='5' 
-        consumer='on_ambient_change'
-        supplier='core.get_setting("audio.volume-ambient")'/>
-    <label id='l_music'>-</label>
-    <trackbar min='0' max='1' value='1' step='0.01' track-width='5' 
-        consumer='on_music_change'
-        supplier='core.get_setting("audio.volume-music")'/>
+    <panel id='tracks_panel' size='400' color='0' interval='1'>
+        <!-- content is generated in script -->
+    </panel>
     <button padding='10' onclick='menu:back()'>@Back</button>
 </panel>
diff --git a/res/layouts/pages/settings-audio.xml.lua b/res/layouts/pages/settings-audio.xml.lua
index dd09fefc..f23426e8 100644
--- a/res/layouts/pages/settings-audio.xml.lua
+++ b/res/layouts/pages/settings-audio.xml.lua
@@ -1,4 +1,12 @@
 function on_open()
+    new_volume_control("audio.volume-master", "master")
+    new_volume_control("audio.volume-regular", "regular")
+    new_volume_control("audio.volume-ui", "ui")
+    new_volume_control("audio.volume-ambient", "ambient")
+    new_volume_control("audio.volume-music", "music")
+
+    gui.reindex("core:pages/settings-audio")
+
     on_master_change()
     on_regular_change()
     on_ui_change()
@@ -6,32 +14,45 @@ function on_open()
     on_music_change()
 end
 
-function on_volume_change(setting, label, name, val)
+
+function new_volume_control(setting, id, name)
+    -- value text label
+    document.tracks_panel:add("<label id='l_"..id.."'>-</label>")
+    -- value track-bar
+    document.tracks_panel:add(string.format(
+        "<trackbar id='t_%s' min='0' max='1' value='1' step='0.01' track-width='5' "..
+        " consumer='on_%s_change'/>"
+    , id, id))
+end
+
+function on_volume_change(setting, id, name, val)
     if val ~= nil then
         core.set_setting(setting, val)
+    else
+        document["t_"..id].value = core.get_setting(setting, val)
     end
-    label.text = (
+    document["l_"..id].text = (
         gui.str(name, "settings")..": "..
         core.str_setting(setting)
     )
 end
 
 function on_master_change(val)
-    on_volume_change("audio.volume-master", document.l_master, "Master Volume", val)
+    on_volume_change("audio.volume-master", "master", "Master Volume", val)
 end
 
 function on_regular_change(val)
-    on_volume_change("audio.volume-regular", document.l_regular, "Regular Sounds", val)
+    on_volume_change("audio.volume-regular", "regular", "Regular Sounds", val)
 end
 
 function on_ui_change(val)
-    on_volume_change("audio.volume-ui", document.l_ui, "UI Sounds", val)
+    on_volume_change("audio.volume-ui", "ui", "UI Sounds", val)
 end
 
 function on_ambient_change(val)
-    on_volume_change("audio.volume-ambient", document.l_ambient, "Ambient", val)
+    on_volume_change("audio.volume-ambient", "ambient", "Ambient", val)
 end
 
 function on_music_change(val)
-    on_volume_change("audio.volume-music", document.l_music, "Music", val)
+    on_volume_change("audio.volume-music", "music", "Music", val)
 end
diff --git a/src/frontend/UiDocument.cpp b/src/frontend/UiDocument.cpp
index d68ff06c..01d74aff 100644
--- a/src/frontend/UiDocument.cpp
+++ b/src/frontend/UiDocument.cpp
@@ -13,9 +13,12 @@ UiDocument::UiDocument(
     std::shared_ptr<gui::UINode> root,
     std::unique_ptr<scripting::Environment> env
 ) : id(id), script(script), root(root), env(std::move(env)) {
-    collect(map, root);
+    buildIndices(map, root);
 }
 
+void UiDocument::rebuildIndices() {
+    buildIndices(map, root);
+}
 
 const uinodes_map& UiDocument::getMap() const {
     return map;
@@ -45,7 +48,7 @@ int UiDocument::getEnvironment() const {
     return env->getId();
 }
 
-void UiDocument::collect(uinodes_map& map, std::shared_ptr<gui::UINode> node) {
+void UiDocument::buildIndices(uinodes_map& map, std::shared_ptr<gui::UINode> node) {
     const std::string& id = node->getId();
     if (!id.empty()) {
         map[id] = node;
@@ -53,7 +56,7 @@ void UiDocument::collect(uinodes_map& map, std::shared_ptr<gui::UINode> node) {
     auto container = std::dynamic_pointer_cast<gui::Container>(node);
     if (container) {
         for (auto subnode : container->getNodes()) {
-            collect(map, subnode);
+            buildIndices(map, subnode);
         }
     }
 }
diff --git a/src/frontend/UiDocument.h b/src/frontend/UiDocument.h
index 8583f34d..1de3c7ac 100644
--- a/src/frontend/UiDocument.h
+++ b/src/frontend/UiDocument.h
@@ -38,14 +38,16 @@ public:
         std::unique_ptr<scripting::Environment> env
     );
 
+    void rebuildIndices();
+
     const std::string& getId() const;
     const uinodes_map& getMap() const;
     const std::shared_ptr<gui::UINode> getRoot() const;
     const std::shared_ptr<gui::UINode> get(const std::string& id) const;
     const uidocscript& getScript() const;
     int getEnvironment() const;
-    /* Collect map of all uinodes having identifiers */
-    static void collect(uinodes_map& map, std::shared_ptr<gui::UINode> node);
+    // @brief Collect map of all uinodes having identifiers
+    static void buildIndices(uinodes_map& map, std::shared_ptr<gui::UINode> node);
 
     static std::unique_ptr<UiDocument> read(int env, std::string name, fs::path file);
     static std::shared_ptr<gui::UINode> readElement(fs::path file);
diff --git a/src/graphics/ui/gui_util.cpp b/src/graphics/ui/gui_util.cpp
index dbc9fd62..6b4dc96e 100644
--- a/src/graphics/ui/gui_util.cpp
+++ b/src/graphics/ui/gui_util.cpp
@@ -31,10 +31,12 @@ std::shared_ptr<Button> guiutil::gotoButton(
     ));
 }
 
-std::shared_ptr<gui::UINode> guiutil::create(const std::string& source) {
-    scripting::Environment env(0);
+std::shared_ptr<gui::UINode> guiutil::create(const std::string& source, int envid) {
+    scripting::Environment env(envid);
     UiXmlReader reader(env);
-    return reader.readXML("<string>", source);
+    auto node = reader.readXML("<string>", source);
+    env.release();
+    return node;
 }
 
 void guiutil::alert(GUI* gui, const std::wstring& text, runnable on_hidden) {
diff --git a/src/graphics/ui/gui_util.h b/src/graphics/ui/gui_util.h
index 8ce095dc..97ce97cf 100644
--- a/src/graphics/ui/gui_util.h
+++ b/src/graphics/ui/gui_util.h
@@ -23,7 +23,7 @@ namespace guiutil {
 
     /// @brief Create element from XML
     /// @param source XML
-    std::shared_ptr<gui::UINode> create(const std::string& source);
+    std::shared_ptr<gui::UINode> create(const std::string& source, int env=0);
 
     void alert(
         gui::GUI* gui, 
diff --git a/src/logic/scripting/lua/libgui.cpp b/src/logic/scripting/lua/libgui.cpp
index bd46800a..ece5f19a 100644
--- a/src/logic/scripting/lua/libgui.cpp
+++ b/src/logic/scripting/lua/libgui.cpp
@@ -15,7 +15,12 @@
 #include "../../../frontend/locale/langs.h"
 #include "../../../util/stringutil.h"
 
-static gui::UINode* getDocumentNode(lua_State* L, const std::string& name, const std::string& nodeName) {
+struct DocumentNode {
+    UiDocument* document;
+    gui::UINode* node;
+};
+
+static DocumentNode getDocumentNode(lua_State* L, const std::string& name, const std::string& nodeName) {
     auto doc = scripting::engine->getAssets()->getLayout(name);
     if (doc == nullptr) {
         luaL_error(L, "document '%s' not found", name.c_str());
@@ -24,7 +29,7 @@ static gui::UINode* getDocumentNode(lua_State* L, const std::string& name, const
     if (node == nullptr) {
         luaL_error(L, "document '%s' has no element with id '%s'", name.c_str(), nodeName.c_str());
     }
-    return node.get();
+    return {doc, node.get()};
 }
 
 static bool getattr(lua_State* L, gui::TrackBar* bar, const std::string& attr) {
@@ -119,7 +124,7 @@ static bool getattr(lua_State* L, gui::TextBox* box, const std::string& attr) {
     return false;
 }
 
-static gui::UINode* getDocumentNode(lua_State* L) {
+static DocumentNode getDocumentNode(lua_State* L) {
     lua_getfield(L, 1, "docname");
     lua_getfield(L, 1, "name");
     auto docname = lua_tostring(L, -2);
@@ -131,7 +136,7 @@ static gui::UINode* getDocumentNode(lua_State* L) {
 
 static int menu_back(lua_State* L) {
     auto node = getDocumentNode(L);
-    auto menu = dynamic_cast<gui::Menu*>(node);
+    auto menu = dynamic_cast<gui::Menu*>(node.node);
     menu->back();
     return 0;
 }
@@ -210,10 +215,11 @@ static bool setattr(lua_State* L, gui::Menu* menu, const std::string& attr) {
 }
 
 static int container_add(lua_State* L) {
-    auto node = dynamic_cast<gui::Container*>(getDocumentNode(L));
+    auto docnode = getDocumentNode(L);
+    auto node = dynamic_cast<gui::Container*>(docnode.node);
     auto xmlsrc = lua_tostring(L, 2);
     try {
-        node->add(guiutil::create(xmlsrc));
+        node->add(guiutil::create(xmlsrc, docnode.document->getEnvironment()));
     } catch (const std::exception& err) {
         luaL_error(L, err.what());
     }
@@ -235,7 +241,8 @@ static int l_gui_getattr(lua_State* L) {
     auto docname = lua_tostring(L, 1);
     auto element = lua_tostring(L, 2);
     const std::string attr = lua_tostring(L, 3);
-    auto node = getDocumentNode(L, docname, element);
+    auto docnode = getDocumentNode(L, docname, element);
+    auto node = docnode.node;
 
     if (attr == "color") {
         return lua::pushcolor_arr(L, node->getColor());
@@ -281,7 +288,8 @@ static int l_gui_setattr(lua_State* L) {
     auto element = lua_tostring(L, 2);
     const std::string attr = lua_tostring(L, 3);
 
-    auto node = getDocumentNode(L, docname, element);
+    auto docnode = getDocumentNode(L, docname, element);
+    auto node = docnode.node;
     if (attr == "pos") {
         node->setPos(lua::tovec2(L, 4));
     } else if (attr == "size") {
@@ -332,11 +340,22 @@ static int l_gui_str(lua_State* L) {
     return 1;
 }
 
+static int l_gui_reindex(lua_State* L) {
+    auto name = lua_tostring(L, 1);
+    auto doc = scripting::engine->getAssets()->getLayout(name);
+    if (doc == nullptr) {
+        luaL_error(L, "document '%s' not found", name);
+    }
+    doc->rebuildIndices();
+    return 0;
+}
+
 const luaL_Reg guilib [] = {
     {"get_viewport", lua_wrap_errors<l_gui_getviewport>},
     {"getattr", lua_wrap_errors<l_gui_getattr>},
     {"setattr", lua_wrap_errors<l_gui_setattr>},
     {"get_env", lua_wrap_errors<l_gui_get_env>},
     {"str", lua_wrap_errors<l_gui_str>},
+    {"reindex", lua_wrap_errors<l_gui_reindex>},
     {NULL, NULL}
 };
diff --git a/src/logic/scripting/scripting.cpp b/src/logic/scripting/scripting.cpp
index 9db79551..5c1d1558 100644
--- a/src/logic/scripting/scripting.cpp
+++ b/src/logic/scripting/scripting.cpp
@@ -47,6 +47,10 @@ int Environment::getId() const {
     return env;
 }
 
+void Environment::release() {
+    env = 0;
+}
+
 void load_script(fs::path name) {
     auto paths = scripting::engine->getPaths();
     fs::path file = paths->getResources()/fs::path("scripts")/name;
diff --git a/src/logic/scripting/scripting.h b/src/logic/scripting/scripting.h
index 802fe8b1..b7e8d728 100644
--- a/src/logic/scripting/scripting.h
+++ b/src/logic/scripting/scripting.h
@@ -41,6 +41,9 @@ namespace scripting {
         ~Environment();
 
         int getId() const;
+
+        // @brief Release namespace control
+        void release();
     };
 
     void initialize(Engine* engine);