diff --git a/test.ipynb b/test.ipynb
new file mode 100644
index 000000000..3dd574b9b
--- /dev/null
+++ b/test.ipynb
@@ -0,0 +1,203 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "from aiida import load_profile\n",
+    "\n",
+    "_ = load_profile()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import asyncio\n",
+    "from time import sleep\n",
+    "\n",
+    "import ipywidgets as ipw\n",
+    "import matplotlib.pyplot as plt\n",
+    "import numpy as np\n",
+    "import traitlets as tl\n",
+    "\n",
+    "from aiida import orm\n",
+    "from aiidalab_qe.common.widgets import LoadingWidget\n",
+    "\n",
+    "\n",
+    "class Model(tl.HasTraits):\n",
+    "    node_id = tl.Unicode()\n",
+    "    node = tl.Instance(orm.Node, allow_none=True)\n",
+    "\n",
+    "    bands = tl.Instance(\n",
+    "        np.ndarray,\n",
+    "        default_value=np.array([]),\n",
+    "    )\n",
+    "    kpoints = tl.Instance(\n",
+    "        np.ndarray,\n",
+    "        default_value=np.array([]),\n",
+    "    )\n",
+    "\n",
+    "    title = \"\"\n",
+    "\n",
+    "    def load_node(self):\n",
+    "        try:\n",
+    "            self.node = orm.load_node(self.node_id)\n",
+    "        except Exception as e:\n",
+    "            print(f\"Failed to load node: {e}\")\n",
+    "\n",
+    "\n",
+    "class BandsViewer(ipw.VBox):\n",
+    "    def __init__(self, vid, model: Model, **kwargs):\n",
+    "        super().__init__(\n",
+    "            children=[LoadingWidget(\"Loading data fetcher\")],\n",
+    "            **kwargs,\n",
+    "        )\n",
+    "\n",
+    "        self._id = vid\n",
+    "        self._model = model\n",
+    "        self._model.observe(\n",
+    "            self._on_node_uuid_change,\n",
+    "            \"node_id\",\n",
+    "        )\n",
+    "\n",
+    "        self.rendered = False\n",
+    "\n",
+    "    def render(self):\n",
+    "        if self.rendered:\n",
+    "            return\n",
+    "\n",
+    "        self.bands = ipw.Label(value=\"Fetching attribute 1...\")\n",
+    "        ipw.dlink(\n",
+    "            (self._model, \"bands\"),\n",
+    "            (self.bands, \"value\"),\n",
+    "            lambda bands: f\"Bands count: {len(bands)}\",\n",
+    "        )\n",
+    "\n",
+    "        self.kpoints = ipw.Label(value=\"Fetching attribute 2...\")\n",
+    "        ipw.dlink(\n",
+    "            (self._model, \"kpoints\"),\n",
+    "            (self.kpoints, \"value\"),\n",
+    "            lambda kpoints: f\"Kpoints count: {len(kpoints)}\",\n",
+    "        )\n",
+    "\n",
+    "        self.plot_button = ipw.Button(description=\"Plot bands\")\n",
+    "        ipw.dlink(\n",
+    "            (self._model, \"node\"), (self.plot_button, \"disabled\"), lambda node: not node\n",
+    "        )\n",
+    "        self.plot_button.on_click(lambda _: asyncio.create_task(self.fetch_and_plot()))\n",
+    "\n",
+    "        self.plot_area = ipw.Output()\n",
+    "\n",
+    "        self.children = [\n",
+    "            ipw.HBox(\n",
+    "                children=[\n",
+    "                    ipw.Label(str(self._id)),\n",
+    "                    ipw.VBox(\n",
+    "                        children=[\n",
+    "                            self.bands,\n",
+    "                            self.kpoints,\n",
+    "                            self.plot_button,\n",
+    "                        ]\n",
+    "                    ),\n",
+    "                ]\n",
+    "            ),\n",
+    "            self.plot_area,\n",
+    "        ]\n",
+    "\n",
+    "        self.rendered = True\n",
+    "\n",
+    "    def _on_node_uuid_change(self, change):\n",
+    "        if change[\"new\"]:\n",
+    "            self.node = self._model.load_node()\n",
+    "\n",
+    "    async def fetch_bands(self):\n",
+    "        await asyncio.sleep(1)\n",
+    "        node = self._model.node\n",
+    "        bands = node.outputs.bands.bands.band_structure.get_array(\"bands\")\n",
+    "        self._model.bands = bands\n",
+    "\n",
+    "    async def fetch_kpoints(self):\n",
+    "        await asyncio.sleep(2)\n",
+    "        node = self._model.node\n",
+    "        kpoints = node.outputs.bands.bands.band_structure.get_array(\"kpoints\")\n",
+    "        self._model.kpoints = kpoints\n",
+    "\n",
+    "    async def plot_bands(self):\n",
+    "        await asyncio.sleep(0.5)\n",
+    "        self.plot_area.clear_output()\n",
+    "        with self.plot_area:\n",
+    "            print(len(self._model.bands))\n",
+    "            plt.title(self._model.title)\n",
+    "            _ = plt.plot(self._model.bands)\n",
+    "        plt.show()\n",
+    "\n",
+    "    async def fetch_and_plot(self):\n",
+    "        await asyncio.gather(\n",
+    "            self.fetch_bands(),\n",
+    "            self.fetch_kpoints(),\n",
+    "        )\n",
+    "        await self.plot_bands()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "models = []\n",
+    "for i in range(1, 5):\n",
+    "    model = Model()\n",
+    "    models.append(model)\n",
+    "    model.title = f\"Band structure {i}\"\n",
+    "    loader = BandsViewer(vid=i, model=model)\n",
+    "    display(loader)\n",
+    "    sleep(0.5)\n",
+    "    loader.render()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "for model in models:\n",
+    "    model.node_id = \"5216\""
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "base",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.9.13"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}