diff --git a/src/extensions/id.rs b/src/extensions/id.rs
index 66259d4..de629d9 100644
--- a/src/extensions/id.rs
+++ b/src/extensions/id.rs
@@ -1,22 +1,18 @@
-use std::sync::{Arc, Mutex};
+use std::sync::Arc;
 
-use crate::{component, extensions::Extension, widget::Widget};
+use crate::{component, extensions::Extension, widget::Widget, Screen};
 
-pub struct IdExtension(Mutex<Vec<Arc<Widget>>>);
+pub struct IdExtension(pub Arc<Screen>);
 
-impl Extension for Arc<IdExtension> {
-    fn init(&mut self, widgets: &Vec<Arc<Widget>>) {
-        self.0.lock().unwrap().append(&mut widgets.clone());
-    }
-}
+impl Extension for Arc<IdExtension> {}
 
 impl IdExtension {
-    pub fn new() -> Arc<Self> {
-        Arc::new(Self(Mutex::new(Vec::new())))
+    pub fn new(screen: Arc<Screen>) -> Arc<Self> {
+        Arc::new(IdExtension(screen))
     }
 
     pub fn get_element(self: &Arc<IdExtension>, id: usize) -> Option<Arc<Widget>> {
-        for elem in self.0.lock().unwrap().iter() {
+        for elem in self.0.widgets.lock().unwrap().iter() {
             if let Some(current_id) = elem.get::<Id>() {
                 if current_id.0 == id {
                     return Some(elem.clone());
diff --git a/src/extensions/mod.rs b/src/extensions/mod.rs
index 1745c5d..0bc0e5b 100644
--- a/src/extensions/mod.rs
+++ b/src/extensions/mod.rs
@@ -1,7 +1,7 @@
 pub mod id;
+pub mod resources;
 pub mod tick;
 pub mod velocity;
-pub mod resources;
 
 use std::{
     any::{type_name, Any},
@@ -12,10 +12,11 @@ use std::{
 use crate::{
     render_scope::RenderScope,
     widget::{Component, Widget},
+    Screen,
 };
 
 pub trait Extension {
-    fn init(&mut self, _widgets: &Vec<Arc<Widget>>) {}
+    fn init(&mut self, _screen: Arc<Screen>) {}
     fn render_widget(&mut self, _scope: &mut RenderScope, _widget: &Arc<Widget>) {}
 }
 
diff --git a/src/extensions/resources.rs b/src/extensions/resources.rs
index d529382..1542111 100644
--- a/src/extensions/resources.rs
+++ b/src/extensions/resources.rs
@@ -1,16 +1,22 @@
-use crate::{event, widget::Component};
+use std::sync::{Arc, Mutex};
 
-#[derive(Debug, Clone)]
-pub struct Resource<T>(pub T);
+#[derive(Clone)]
+pub struct VecResource<T>(Arc<Mutex<Box<dyn FnMut(&T) + Send + Sync>>>);
 
-impl<T: Send + Sync + 'static> Component for Resource<T> {
-    fn as_any(&self) -> &dyn std::any::Any {
-        self
+impl<T: Send + Sync + 'static> VecResource<T> {
+    pub fn new() -> Self {
+        Self(Arc::new(Mutex::new(Box::new(|_| {}))))
     }
 
-    fn as_any_mut(&mut self) -> &mut dyn std::any::Any {
-        self
+    pub fn iterate<F: FnMut(&T) + Send + Sync + 'static>(&self, f: F) {
+        *self.0.lock().unwrap() = Box::new(f);
+    }
+
+    pub fn push(&self, e: T) {
+        let i = self.0.clone();
+
+        std::thread::spawn(move || {
+            (i.lock().unwrap())(&e);
+        });
     }
 }
-
-event!(ResourceUpdate);
diff --git a/src/extensions/tick.rs b/src/extensions/tick.rs
index d203f41..9ee857a 100644
--- a/src/extensions/tick.rs
+++ b/src/extensions/tick.rs
@@ -1,20 +1,19 @@
 use std::{fmt::Debug, sync::Arc};
 
-use crate::event;
+use crate::extensions::Extension;
 use crate::extensions::Handler;
-use crate::{extensions::Extension, widget::Widget};
+use crate::{event, Screen};
 
 pub struct TickExtension(pub u16);
 
 impl Extension for TickExtension {
-    fn init(&mut self, widgets: &Vec<Arc<Widget>>) {
+    fn init(&mut self, screen: Arc<Screen>) {
         let rate_dur = 1000 / self.0 as u64;
         std::thread::spawn({
-            let widgets = widgets.clone();
             move || {
                 let mut tick = 0;
                 loop {
-                    for w in &widgets {
+                    for w in screen.widgets.lock().unwrap().iter() {
                         if let Some(on_tick) = w.get::<Handler<TickEvent>>() {
                             on_tick.call(&w, &TickEvent(tick))
                         }
diff --git a/src/extensions/velocity.rs b/src/extensions/velocity.rs
index c33acf5..1f3fefb 100644
--- a/src/extensions/velocity.rs
+++ b/src/extensions/velocity.rs
@@ -5,6 +5,7 @@ use crate::{
     extensions::Extension,
     style::{Position, Transform},
     widget::Widget,
+    Screen,
 };
 
 pub struct VelocityExtension;
@@ -42,13 +43,12 @@ impl VelocityExtension {
 }
 
 impl Extension for VelocityExtension {
-    fn init(&mut self, widgets: &Vec<Arc<Widget>>) {
+    fn init(&mut self, screen: Arc<Screen>) {
         std::thread::spawn({
-            let widgets = widgets.clone();
             move || {
                 let mut tick = 0;
                 loop {
-                    for widget in &widgets {
+                    for widget in screen.widgets.lock().unwrap().iter() {
                         Self::apply_velocity_xy(tick, widget);
                     }
                     if tick > 1000 {
diff --git a/src/lib.rs b/src/lib.rs
index fe9ac0e..3318b90 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -16,8 +16,8 @@ pub mod utils;
 pub mod widget;
 
 pub struct Screen {
-    pub widgets: Vec<Arc<Widget>>,
-    extensions: Vec<Arc<Mutex<Box<dyn Extension>>>>,
+    pub widgets: Mutex<Vec<Arc<Widget>>>,
+    extensions: Mutex<Vec<Arc<Mutex<Box<dyn Extension + Send + Sync>>>>>,
 }
 
 event!(RenderWrapperEvent(*mut RenderScope));
@@ -32,29 +32,33 @@ unsafe impl Send for RenderWrapperEvent {}
 unsafe impl Sync for RenderWrapperEvent {}
 
 impl Screen {
-    pub fn new() -> Screen {
-        Screen {
-            widgets: Vec::new(),
-            extensions: Vec::new(),
-        }
+    pub fn new() -> Arc<Self> {
+        Arc::new(Self {
+            widgets: Mutex::new(Vec::new()),
+            extensions: Mutex::new(Vec::new()),
+        })
     }
 
-    pub fn draw<E: Element + 'static>(&mut self, element: E) -> &Arc<Widget> {
-        self.widgets.push(Arc::new(Widget::new(Box::new(element))));
-        self.widgets.last().unwrap()
+    pub fn draw<E: Element + 'static>(self: &Arc<Self>, element: E) -> Arc<Widget> {
+        let w = Arc::new(Widget::new(Box::new(element)));
+        self.widgets.lock().unwrap().push(w.clone());
+        w
     }
 
-    pub fn extension<E: Extension + 'static>(&mut self, ext: E) {
-        self.extensions.push(Arc::new(Mutex::new(Box::new(ext))));
+    pub fn extension<E: Extension + Send + Sync + 'static>(self: &Arc<Self>, ext: E) {
+        self.extensions
+            .lock()
+            .unwrap()
+            .push(Arc::new(Mutex::new(Box::new(ext))));
     }
 
-    pub fn run(&mut self) -> std::io::Result<()> {
-        for elem in &mut self.widgets {
+    pub fn run(self: &Arc<Self>) -> std::io::Result<()> {
+        for elem in self.widgets.lock().unwrap().iter() {
             elem.component(Transform::new());
         }
 
-        for ext in &self.extensions {
-            ext.lock().unwrap().init(&self.widgets);
+        for ext in self.extensions.lock().unwrap().iter() {
+            ext.lock().unwrap().init(self.clone());
         }
 
         utils::hide_cursor()?;
@@ -65,13 +69,13 @@ impl Screen {
         }
     }
 
-    pub fn render(&self) -> std::io::Result<()> {
+    pub fn render(self: &Arc<Self>) -> std::io::Result<()> {
         let mut scope = RenderScope::new();
         let (w, h) = crossterm::terminal::size().unwrap();
         scope.set_parent_size(w, h);
 
         utils::clear()?;
-        for elem in &self.widgets {
+        for elem in self.widgets.lock().unwrap().iter() {
             if let Some(wrapper) = elem.get::<Handler<RenderWrapperEvent>>() {
                 wrapper.call(elem, &RenderWrapperEvent(&mut scope));
             } else {
@@ -80,7 +84,7 @@ impl Screen {
                     scope.set_transform(&t);
                 }
 
-                for ext in &self.extensions {
+                for ext in self.extensions.lock().unwrap().iter() {
                     ext.lock().unwrap().render_widget(&mut scope, elem);
                 }
 
diff --git a/src/main.rs b/src/main.rs
index c661349..d1f4041 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,10 +1,7 @@
 use osui::{
-    elements::{
-        div::Div,
-        grid::{HGrid, VGrid},
-    },
+    elements::grid::VGrid,
     extensions::{
-        resources::Resource,
+        resources::VecResource,
         tick::{TickEvent, TickExtension},
         Handler,
     },
@@ -13,43 +10,35 @@ use osui::{
 };
 
 fn main() {
-    let mut screen = Screen::new();
+    let screen = Screen::new();
     screen.extension(TickExtension(10));
 
-    let container = Div::new(0xffff00);
+    let items = <VecResource<&str>>::new();
+
+    let vgrid = VGrid::new(0x000000, 0);
 
     screen
-        .draw(container.clone())
-        .component(Transform::center().dimensions(70, 11));
+        .draw(vgrid.clone())
+        .component(Transform::center())
+        .component(Handler::new({
+            let items = items.clone();
+            move |_, e: &TickEvent| {
+                if e.0 == 1 {
+                    items.push("Hello?");
+                }
+            }
+        }));
 
-    let vgrid = VGrid::new(0x0000ff, 1);
-
-    container.draw(screen.draw(vgrid.clone()).component(Transform::center()));
-
-    for _ in 1..6 {
-        let row = HGrid::new(0xff00ff, 1);
-
-        let row_widget = vgrid.draw(
-            screen
-                .draw(row.clone())
-                .component(Resource(Vec::<&str>::from(["Test"])))
-                .component(Handler::new(|w, t: &TickEvent| {
-                    if t.0 >= 10 {
-                        let mut res = w.get::<Resource<Vec<&str>>>().unwrap();
-                        res.0.push("Hello World");
-                        w.set_component(res);
-                    }
-                })),
-        );
-
-        for i in row_widget.get::<Resource<Vec<&str>>>().unwrap().0 {
-            row.draw(
+    items.iterate({
+        let screen = screen.clone();
+        move |i| {
+            vgrid.draw(
                 screen
                     .draw((i.to_string(), 0xff0000))
                     .component(Transform::new()),
             );
         }
-    }
+    });
 
     screen.run().unwrap();
 }