diff --git a/src/grid.rs b/src/grid.rs
index 8829780..85b781c 100644
--- a/src/grid.rs
+++ b/src/grid.rs
@@ -4,18 +4,21 @@ pub struct Grid {
     inner: gtk::Grid,
 }
 
+#[derive(Debug,Copy,Clone)]
 pub struct CellPosition(i32, i32);
 
 impl Grid {
-    // Initialize a grid, populating its cells
-    // Only square grid for now
-    pub fn init(inner: gtk::Grid, size: i32) -> Self {
+    /// Initialize a grid, populating its cells
+    /// Only square grid for now
+    pub(crate) fn init(inner: gtk::Grid, size: i32, app_state: AppState) -> Self {
         for i in 0..(size * size) {
             let x = i % size;
             let y = i / size;
-            let cell = grid::Cell::new(CellPosition(x,y));
+            let cell = grid::Cell::new(
+                CellPosition(x,y)
+            );
+            cell.connect_clicked(app_state.clone());
             inner.attach(cell.as_ref(), x, y, 1, 1);
-            // Signals
         }
         Grid { inner }
     }
@@ -26,6 +29,7 @@ struct CellWidget {
     eventbox: gtk::EventBox,
     position: gtk::Label,
     header : gtk::Label,
+    content: gtk::Label,
 }
 
 impl CellWidget {
@@ -68,25 +72,28 @@ impl CellWidget {
                 .unwrap();
         position.set_text(&format!("{}x{}", pos.0, pos.1));
 
-        let header_clone = header.clone();
-        eventbox.connect_button_press_event(Self::on_click(header_clone));
-
-        CellWidget {
+        let cell = CellWidget {
             eventbox,
             position,
             header,
-        }
+            content: builder.get_object("content").unwrap(),
+        };
+        cell
     }
 
-    // Handler for button press events
-    fn on_click(
-        data: gtk::Label
-    ) -> impl Fn(&gtk::EventBox, &gdk::EventButton) -> gtk::Inhibit
-    {
-        move |_,_| {
-            data.set_text("Clicked.");
-            gtk::Inhibit(true)
-        }
+    pub fn connect_clicked(&self, state: AppState) {
+        let header = self.header.clone();
+        let content = self.content.clone();
+        self.eventbox
+            .connect_button_press_event(move |_,_| {
+                let mut state = state.borrow_mut();
+                if let Some(data) = state.pending.take() {
+                    println!("{:?}", data);
+                    content.set_text(&data.name);
+                };
+                header.set_text("Is Clicked.");
+                gtk::Inhibit(true)
+            });
     }
 }
 
@@ -97,21 +104,22 @@ impl AsRef<gtk::EventBox> for CellWidget {
     }
 }
 
-pub struct Cell {
+struct Cell {
     inner: CellWidget,
-    is_active: bool,
-    is_occupied: bool,
+    position: CellPosition,
 }
 
 impl Cell {
-    pub fn new(pos: CellPosition) -> Self {
-        let inner = CellWidget::new(pos, "Empty cell");
+    fn new(position: CellPosition) -> Self {
         Cell {
-            inner,
-            is_active: false,
-            is_occupied: false,
+            inner: CellWidget::new(position, ""),
+            position
         }
     }
+
+    fn connect_clicked(&self, state: AppState) {
+        self.inner.connect_clicked(state);
+    }
 }
 
 impl AsRef<gtk::EventBox> for Cell {
diff --git a/src/main.rs b/src/main.rs
index f30b863..f25ba1c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -3,109 +3,44 @@ extern crate gio;
 extern crate gdk;
 extern crate glib;
 
-use gtk::BoxExt;
+use std::cell::RefCell;
+use std::rc::Rc;
+
 use gtk::prelude::*;
 use gio::prelude::*;
 use std::env::args;
 use std::process;
 
 mod grid;
+mod pawn;
 
-mod pawn {
-    use super::*;
-
-    #[derive(Debug,Clone)]
-    pub struct PawnList {
-        inner: gtk::ListBox,
-    }
-
-    impl PawnList {
-        pub fn init(inner: gtk::ListBox) -> Self {
-            PawnList{ inner }
-        }
-
-        pub fn add(&self, pawn: &Pawn) {
-            let row = gtk::ListBoxRow::new();
-            row.add(pawn.as_ref());
-            self.inner.add(&row);
-        }
-    }
-
-    struct PawnData {
-        name: String,
-    }
-
-
-    pub struct Pawn {
-        data: PawnData,
-        widget: gtk::Box,
-    }
-
-    impl Pawn {
-
-        pub fn new<S: Into<String>>(name: S) -> Self {
-            let pawn_src = include_str!("../res/pawn.glade");
-            let builder = gtk::Builder::new_from_string(pawn_src);
-            let name = name.into();
-            let label: gtk::Label =
-                builder
-                    .get_object("name")
-                    .unwrap();
-            label.set_text(&name);
-            let place_btn: gtk::Button =
-                builder
-                    .get_object("place_btn")
-                    .unwrap();
-            place_btn.connect_clicked(|_| {
-                println!("Placing...");
-            });
-            let stats_btn: gtk::Button =
-                builder
-                    .get_object("stats_btn")
-                    .unwrap();
-            stats_btn.connect_clicked(|_| {
-                println!("Showing stats...");
-            });
-
-            let widget: gtk::Box = builder.get_object("pawn").unwrap();
-            Pawn {
-                data: PawnData{ name },
-                widget,
-            }
-        }
-    }
-
-    impl AsRef<gtk::Box> for Pawn {
-        fn as_ref(&self) -> &gtk::Box {
-            &self.widget
-        }
-    }
-
-    pub fn pawn_factory() -> Vec<Pawn> {
-        let mut pawns = Vec::with_capacity(3);
-        for name in &["Lomion", "Oilosse", "Fefi"] {
-            pawns.push(Pawn::new(*name));
-        }
-        pawns
-    }
-
-    #[cfg(test)]
-    mod tests {
-        #[test]
-        fn test_pawn_factory() {
-            let pawns = pawn_factory();
-            assert_eq!(pawns.len(), 3);
-            assert_eq!(pawns.get(2).unwrap(), "Fefi");
-        }
-    }
+/// Content of the Application state
+///
+#[derive(Debug,Clone,Default)]
+pub struct AppData {
+    /// A slot for any pawn waiting for placement
+    pending: Option<pawn::PawnData>,
+    /// Owned list of pawns
+    pawns: Vec<pawn::Pawn>,
 }
 
+/// A sharable state for the whole application
+#[derive(Debug,Clone,Default)]
+pub struct AppState(Rc<RefCell<AppData>>);
+
+impl std::ops::Deref for AppState {
+    type Target = Rc<RefCell<AppData>>;
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
 
 struct App {
     inner: gtk::Application,
-    pawns: Vec<pawn::Pawn>,
+    state: AppState,
 }
 
+
 impl App {
     fn new<'a>() -> Result<Self, &'a str> {
         let app =
@@ -114,55 +49,63 @@ impl App {
                         "home.local.PlayMat",
                         gio::ApplicationFlags::FLAGS_NONE
                     ).expect("Failed to build Application"),
-                pawns: Vec::new(),
+                state: Default::default(),
             };
-        app.inner.connect_startup(|_| {});
-        app.inner.connect_activate(Self::on_activate);
+        app.connect_all();
         Ok(app)
     }
 
-    fn on_activate(app: &gtk::Application) {
-        println!("Activate App");
-        let main_src = include_str!("../res/main.glade");
-        let builder = gtk::Builder::new_from_string(main_src);
-        let win: gtk::ApplicationWindow =
-            builder
-                .get_object("app")
-                .unwrap();
-        win.set_application(app);
+    fn connect_all(&self) {
+        let app_state = self.state.clone();
+        self.inner.connect_startup(|_| {});
+        self.inner.connect_activate(
+            move |app| {
+                println!("Activate App");
+                let main_src = include_str!("../res/main.glade");
+                let builder = gtk::Builder::new_from_string(main_src);
+                let win: gtk::ApplicationWindow =
+                    builder
+                        .get_object("app")
+                        .unwrap();
+                win.set_application(app);
 
-        // Set up a simple switch for the Pawn list panel
-        let panel: gtk::Paned = builder.get_object("panel").unwrap();
-        Self::new_action(app, "panel_switch", move |_,_| {
-            if panel.get_position() == 0 {
-                panel.set_position(360);
-            } else {
-                panel.set_position(0);
+                // Set up a simple switch for the Pawn list panel
+                let panel: gtk::Paned = builder.get_object("panel").unwrap();
+                Self::new_action(app, "panel_switch", move |_,_| {
+                    if panel.get_position() == 0 {
+                        panel.set_position(360);
+                    } else {
+                        panel.set_position(0);
+                    }
+                });
+
+                // Initialize grid
+                let grid: gtk::Grid = builder.get_object("map").unwrap();
+                // TODO: implement drag-drop events
+                //   * From pawn_list to cell : place pawn on dest cell
+                //   * From cell to cell : move pawn from source to dest cell
+                let _grid = grid::Grid::init(grid, 10, app_state.clone());
+
+                // TODO:
+                //   * Display creature description when hovering over its position (cell)
+
+                // TODO: Pawn list
+                let pawn_list = builder.get_object("pawn_list").unwrap();
+                let pawn_list = pawn::PawnList::init(pawn_list);
+
+                for pawn in pawn::pawn_factory() {
+                    pawn_list.add(&pawn);
+                    pawn.connect_place(app_state.clone());
+                    pawn.connect_stats();
+                    app_state.borrow_mut().pawns.push(pawn);
+                }
+                win.show_all();
             }
-        });
-
-        // Initialize grid
-        let grid: gtk::Grid = builder.get_object("map").unwrap();
-        // TODO: implement drag-drop events
-        //   * From pawn_list to cell : place pawn on dest cell
-        //   * From cell to cell : move pawn from source to dest cell
-        let _grid = grid::Grid::init(grid, 10);
-
-        // TODO:
-        //   * Display creature description when hovering over its position (cell)
-
-        // TODO: Pawn list
-        let pawn_list = builder.get_object("pawn_list").unwrap();
-        let pawn_list = pawn::PawnList::init(pawn_list);
-
-        for pawn in &pawn::pawn_factory() {
-            pawn_list.add(pawn);
-        }
-        win.show_all();
+        );
     }
 
     /// Creates a simple action and connects the given handler to its activate signal.
-    pub fn new_action<F: Fn(&gio::SimpleAction, &Option<glib::Variant>) + 'static>(
+    fn new_action<F: Fn(&gio::SimpleAction, &Option<glib::Variant>) + 'static>(
         app: &gtk::Application,
         name: &str,
         f: F,
@@ -173,6 +116,7 @@ impl App {
     }
 
     fn run(&self, args: &[String]) -> i32 {
+        println!("{:#?}", &self.state);
         self.inner.run(args)
     }
 }
diff --git a/src/pawn.rs b/src/pawn.rs
new file mode 100644
index 0000000..f500795
--- /dev/null
+++ b/src/pawn.rs
@@ -0,0 +1,99 @@
+
+use super::*;
+
+#[derive(Debug,Clone)]
+pub struct PawnList {
+    inner: gtk::ListBox,
+}
+
+impl PawnList {
+    pub fn init(inner: gtk::ListBox) -> Self {
+        PawnList{ inner }
+    }
+
+    pub fn add(&self, pawn: &Pawn) {
+        let row = gtk::ListBoxRow::new();
+        row.add(pawn.as_ref());
+        self.inner.add(&row);
+    }
+}
+
+#[derive(Debug,Clone)]
+pub struct PawnData {
+    pub name: String,
+    pub position: Option<String>, // Content of label from CellWidget
+}
+
+#[derive(Debug, Clone)]
+pub struct Pawn {
+    data: PawnData,
+    widget: gtk::Box,
+    place_btn: gtk::Button,
+    stats_btn: gtk::Button,
+}
+
+impl Pawn {
+    pub fn new<S: Into<String>>(name: S) -> Self {
+        let pawn_src = include_str!("../res/pawn.glade");
+        let builder = gtk::Builder::new_from_string(pawn_src);
+        let name = name.into();
+        let label: gtk::Label =
+            builder
+                .get_object("name")
+                .unwrap();
+        label.set_text(&name);
+        let widget: gtk::Box = builder.get_object("pawn").unwrap();
+        Pawn {
+            data: PawnData{ name, position: None, },
+            widget,
+            place_btn: builder.get_object("place_btn").unwrap(),
+            stats_btn: builder.get_object("stats_btn").unwrap(),
+        }
+    }
+
+    pub fn connect_place(&self, state: AppState) {
+        let name = self.data.name.clone();
+        let data = self.data.clone();
+        self.place_btn
+            .connect_clicked(
+                move |_| {
+                    println!("Placing {}...", name);
+                    let mut state = state.0.borrow_mut();
+                    state.pending = Some(data.clone()); // ???
+                }
+            );
+    }
+
+    pub fn connect_stats(&self) {
+        self.stats_btn
+            .connect_clicked(
+                move |_| {
+                    println!("Showing stats...");
+                }
+            );
+    }
+}
+
+impl AsRef<gtk::Box> for Pawn {
+    fn as_ref(&self) -> &gtk::Box {
+        &self.widget
+    }
+}
+
+pub fn pawn_factory() -> Vec<Pawn> {
+    let mut pawns = Vec::with_capacity(3);
+    for name in &["Lomion", "Oilosse", "Fefi"] {
+        pawns.push(Pawn::new(*name));
+    }
+    pawns
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn test_pawn_factory() {
+        let pawns = pawn_factory();
+        assert_eq!(pawns.len(), 3);
+        assert_eq!(pawns.get(2).unwrap(), "Fefi");
+    }
+}