diff --git a/docs/api/source/core.server.rst b/docs/api/source/core.server.rst
index 8fa05b15..c2feeb6e 100644
--- a/docs/api/source/core.server.rst
+++ b/docs/api/source/core.server.rst
@@ -9,3 +9,4 @@ server
 
    core.state
    core.controller
+   core.vn_manager
diff --git a/docs/api/source/core.vn_manager.rst b/docs/api/source/core.vn_manager.rst
new file mode 100644
index 00000000..4e9db35d
--- /dev/null
+++ b/docs/api/source/core.vn_manager.rst
@@ -0,0 +1,5 @@
+ui
+=====
+
+.. autoclass:: trame_server.ui.VirtualNodeManager
+   :members:
diff --git a/examples/05_charts/Plotly/01_plotly-charts-resizable.py b/examples/05_charts/Plotly/01_plotly-charts-resizable.py
index 608a0fc6..7555cda6 100644
--- a/examples/05_charts/Plotly/01_plotly-charts-resizable.py
+++ b/examples/05_charts/Plotly/01_plotly-charts-resizable.py
@@ -152,8 +152,8 @@ def create_streamline_fig(width=100, height=100, **kwargs):
     x = np.linspace(-3, 3, 100)
     y = np.linspace(-3, 3, 100)
     Y, X = np.meshgrid(x, y)
-    u = -1 - X**2 + Y
-    v = 1 + X - Y**2
+    u = -1 - X ** 2 + Y
+    v = 1 + X - Y ** 2
 
     # Create streamline figure
     fig = ff.create_streamline(
diff --git a/examples/validation/core/19_virtual_node.py b/examples/validation/core/19_virtual_node.py
new file mode 100644
index 00000000..101c53b7
--- /dev/null
+++ b/examples/validation/core/19_virtual_node.py
@@ -0,0 +1,84 @@
+from trame.app import get_server
+from trame.widgets import vtk, vuetify
+from trame.ui.vuetify import SinglePageLayout
+
+# -----------------------------------------------------------------------------
+# trame
+# -----------------------------------------------------------------------------
+
+server = get_server(
+    # log_network="/Users/sebastien.jourdain/Documents/code/open-source/Web/trame-next/test-examples/logs",
+)
+state, ui = server.state, server.ui
+
+state.toolbar_version = 0
+
+# -----------------------------------------------------------------------------
+# Methods
+# -----------------------------------------------------------------------------
+
+
+@state.change("toolbar_version")
+def udpate_toolbar(toolbar_version=0, **kwargs):
+    if toolbar_version == 1:
+        toolbar_2()
+    elif toolbar_version == 2:
+        toolbar_3()
+    else:
+        toolbar_1()
+
+
+# -----------------------------------------------------------------------------
+# GUI (VirtualNodes)
+# -----------------------------------------------------------------------------
+
+
+def toolbar_1():
+    with ui.toolbar as tb:
+        tb.clear()
+        tb.add_child("Toolbar 1")
+        vuetify.VSpacer()
+        ui.toolbar_selector()
+
+
+def toolbar_2():
+    with ui.toolbar as tb:
+        tb.clear()
+        tb.add_child("Toolbar 2")
+        vuetify.VSpacer()
+        ui.toolbar_selector()
+
+
+def toolbar_3():
+    with ui.toolbar as tb:
+        tb.clear()
+        tb.add_child("Toolbar 3")
+        vuetify.VSpacer()
+        ui.toolbar_selector()
+
+
+with ui.toolbar_selector:
+    with vuetify.VBtnToggle(v_model="toolbar_version"):
+        with vuetify.VBtn():
+            vuetify.VIcon("mdi-numeric-1-circle")
+        with vuetify.VBtn():
+            vuetify.VIcon("mdi-numeric-2-circle")
+        with vuetify.VBtn():
+            vuetify.VIcon("mdi-numeric-3-circle")
+
+
+# -----------------------------------------------------------------------------
+# GUI (Layout)
+# -----------------------------------------------------------------------------
+
+with SinglePageLayout(server) as layout:
+    with layout.toolbar as tb:
+        tb.clear()
+        ui.toolbar(layout)
+
+# -----------------------------------------------------------------------------
+# Main
+# -----------------------------------------------------------------------------
+
+if __name__ == "__main__":
+    server.start()
diff --git a/setup.cfg b/setup.cfg
index a75efd1f..ab1713d5 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -26,14 +26,14 @@ keywords =
 packages = find:
 include_package_data = True
 install_requires =
-    trame-client
+    trame-client>=2.1.0
     trame-components
     trame-deckgl
     trame-markdown
     trame-matplotlib
     trame-plotly
     trame-router
-    trame-server
+    trame-server>=2.1.0
     trame-vega
     trame-vtk
     trame-vuetify
diff --git a/trame/app/__init__.py b/trame/app/__init__.py
index 241491b3..9ef0799b 100644
--- a/trame/app/__init__.py
+++ b/trame/app/__init__.py
@@ -1,5 +1,6 @@
 from trame_server import Server
 from trame_client import module
+from trame_client.widgets.core import VirtualNode
 
 DEFAULT_NAME = "trame"
 AVAILABLE_SERVERS = {}
@@ -33,7 +34,7 @@ def get_server(name=None, create_if_missing=True, **kwargs):
         return AVAILABLE_SERVERS[name]
 
     if create_if_missing:
-        server = Server(name, **kwargs)
+        server = Server(name, VirtualNode, **kwargs)
         server.enable_module(module)  # Always load html module first
         AVAILABLE_SERVERS[name] = server
         return server