diff --git a/bemade_hierarchical_tree_view/rng/hlist.rng b/bemade_hierarchical_tree_view/rng/hlist.rng
index 05fa01e..1e0ccb3 100644
--- a/bemade_hierarchical_tree_view/rng/hlist.rng
+++ b/bemade_hierarchical_tree_view/rng/hlist.rng
@@ -9,6 +9,7 @@
     <rng:define name="hlist">
         <rng:element name="hlist">
             <rng:attribute name="parent_field"/>
+            <rng:attribute name="children_field"/>
             <rng:optional><rng:attribute name="name"/></rng:optional>
             <rng:optional><rng:attribute name="create"/></rng:optional>
             <rng:optional><rng:attribute name="delete"/></rng:optional>
diff --git a/bemade_hierarchical_tree_view/static/src/js/hlist_model.js b/bemade_hierarchical_tree_view/static/src/js/hlist_model.js
index 90bd9a9..26c819d 100644
--- a/bemade_hierarchical_tree_view/static/src/js/hlist_model.js
+++ b/bemade_hierarchical_tree_view/static/src/js/hlist_model.js
@@ -8,72 +8,11 @@ var HListModel = ListModel.extend({
      * @param {string} params.parentField
      */
     init: function (parent, params) {
+        var self = this;
         this._super.apply(this, arguments);
-        this.parentField = params.parentField;
-    },
-    /**
-     *
-     * @override
-     * @private
-     */
-    _readGroup: function (list, options) {
-       var self = this;
-       return this._super(list, options).then(function (result) {
-          return self._readHierarchy(list).then(_.constant(result));
-       });
-    },
-    /**
-     * Fetches hierarchy specific fields on the parent field relation and stores them
-     * in the column datapoint in a special key 'hierarchyData'.
-     * Data for the hierarchy are fetched in batch for all hierarchies, to avoid
-     * multiple calls.
-     *
-     * @param {Object} list
-     * @private
-     * @returns {Promise}
-     */
-    _readHierarchy (list) {
-        const self = this;
-        const parentFieldName = self.parentField;
-        const parentField = list.fields[parentFieldName];
-        /* Each record should have only one parent */
-        if (parentField.type !== 'many2one') {
-            return Promise.resolve();
-        }
-        const hierarchyIds = _.reduce(list.data, function (hierarchyIds, id) {
-           const resId = self.get(id, { raw: true }).res_id;
-           if (resId) {
-               hierarchyIds.push(resId);
-           }
-           return hierarchyIds;
-        }, []);
-        let prom;
-        if (hierarchyIds.length) {
-            prom = this._rpc({
-                model: list.model,
-                method: 'read',
-                args: [hierarchyIds, self.viewFields],
-                context: list.context,
-            });
-        }
-        return Promise.resolve(prom).then(function (result) {
-            _.each(list.data, function(id) {
-                let dp = self.localData[id];
-                let hierarchyData = result && _.findWhere(result, {
-                    id: dp.res_id,
-                });
-                let hierarchyDp = self._makeDataPoint({
-                    context: dp.context,
-                    data: hierarchyData,
-                    fields: list.fields,
-                    fieldsInfo: list.fieldsInfo,
-                    modelName: list.model,
-                    parentID: dp.id,
-                    res_id: dp.res_id,
-                    viewType: 'list',
-                });
-            });
-        });
+        self.parentField = params.parentField;
+        self.loadParams.domain = _.union(self.loadParams.domain,
+            [[self.parentField, '=', false]])
     },
 })
 
diff --git a/bemade_hierarchical_tree_view/static/src/js/hlist_renderer.js b/bemade_hierarchical_tree_view/static/src/js/hlist_renderer.js
index 9f76705..5c2110a 100644
--- a/bemade_hierarchical_tree_view/static/src/js/hlist_renderer.js
+++ b/bemade_hierarchical_tree_view/static/src/js/hlist_renderer.js
@@ -2,37 +2,57 @@
 
 import {ListRenderer} from 'web.ListRenderer'
 
+const toggleClass = 'o_hlist_toggle';
+const toggleIconClass = 'fa-sitemap';
+
 var HierarchicalListRenderer = ListRenderer.extend({
     className: 'o_hlist_view',
     events: _.extend({}, ListRenderer.prototype.events, {
-        'click .o_hierarchy_parent': '_onToggleHierarchyGroup',
+        'click o_hlist_toggle': '_onToggleHierarchyGroup',
     }),
+    /**
+     * @param {string} params.parentField
+     * @param {string} params.childrenField
+     */
     init: function (parent, state, params) {
         this._super.apply(this, arguments);
-    },
-    _renderBody: function () {
-        this._super.apply(this);
 
-    },
-    _renderHierarchy(data, hierarchyLevel) {
+        this.parentField = params.parentField;
+        this.childrenField = params.childrenField;
+    }, // TODO: add header column on left side for toggle
+    /**
+     * @override
+     * @private
+     * @param {Object} record
+     * @returns {jQueryElement} a <tr> element
+     */
+    _renderRow: function (record) {
         var self = this;
-        hierarchyLevel = hierarchyLevel || 0;
-        var result = [];
-        var $tbody = $('<tbody>');
-        _.each(data, function (hierarchyGroup) {
-            if (!$tbody) {
-                $tbody = $('<tbody>');
+        var $tr = this._super.apply(this, arguments)
+        if (this.childrenField in record.data) {
+            let numChildren = record.data[this.childrenField].length
+            if (numChildren > 0) {
+                $td = $('<td>', {class: toggleClass}).append(
+                    $('<span>', {class: toggleIconClass, text: numChildren})
+                )
+            } else {
+                $tr.prepend($('<td>'))
             }
-            $tbody.append(self._renderHierarchyRow(hierarchyGroup, hierarchyLevel));
-            if (hierarchyGroup.data.length) {
-                result.push($tbody);
-                result = result.concat(self._renderHierarchyParent(hierarchyGroup,
-                    hierarchyLevel));
-                $tbody = null;
-            }
-        })
+        }
+        if (record.data.child_ids && record.data.child_ids.length) {
+            $tr.prepend(this._renderHierarchyToggle(record));
+        } else {
+            $tr.prepend($('<td>'))
+        }
     },
-    _renderHierarchyParent(hierarchyGroup, hierarchyLevel) {
+    /**
+     *
+     * @param record
+     * @private
+     * @returns {jQueryElement} a <td> element
+     */
+    _renderHierarchyToggle: function (record) {
+        let numChildren = record.data[this.childrenField].length
 
     }
 })
\ No newline at end of file
diff --git a/bemade_hierarchical_tree_view/static/src/js/hlist_view.js b/bemade_hierarchical_tree_view/static/src/js/hlist_view.js
index 0ec0497..f5b535d 100644
--- a/bemade_hierarchical_tree_view/static/src/js/hlist_view.js
+++ b/bemade_hierarchical_tree_view/static/src/js/hlist_view.js
@@ -30,7 +30,8 @@ var HListView = ListView.extend({
      * @param {Object} viewInfo
      * @param {Object} params
      * @param {boolean} params.hasActionMenus
-     * @param {string} [params.parentField]
+     * @param {string} params.parentField
+     * @param {string} params.childrenField
      * @param {boolean} [params.hasSelectors=true]
      */
     init: function(viewInfo, params) {
@@ -41,8 +42,13 @@ var HListView = ListView.extend({
     _updateMVCParams: function() {
         this._super.apply(this, arguments);
         var attrs = this.arch.attrs;
-        this.loadParams.parentField = attrs.parentField;
-        this.modelParams.parentField = attrs.parentField;
+
+        this.loadParams.parentField = attrs.parent_field;
+
+        this.modelParams.parentField = attrs.parent_field;
+
+        this.rendererParams.parentField = this.modelParams.parentField
+        this.rendererParams.childrenField = attrs.childrenField
     }
 });