diff --git a/src/App.js b/src/App.js
index f9359d1..688346a 100644
--- a/src/App.js
+++ b/src/App.js
@@ -87,11 +87,19 @@ function handleRoomSelected(id)
 }
 
 export default function App() {
+  const [selectedRoom, setSelectedRoom] = React.useState(null);
+
+  function selectAmphiB() {
+    setSelectedRoom("salle-M-GN1-3-av");
+  }
+
   return <>
     <TopBar />
+    <Button onClick={selectAmphiB}>Amphi B</Button>
+    <Button>Salle : {selectedRoom}</Button>
 
     <div style={{ flexGrow: '1', display: 'flex', flexDirection: 'line', flexWrap: 'nowrap' }}>
-      <Map callbackRoomSelected={handleRoomSelected} selectedRoom={null}/>
+      <Map callbackRoomSelected={handleRoomSelected} selectedRoom={selectedRoom}/>
       <RoomResearch />
     </div>
   </>