diff --git a/source/model/meshinstance.js b/source/model/meshinstance.js
index 768df9b..a0c8546 100644
--- a/source/model/meshinstance.js
+++ b/source/model/meshinstance.js
@@ -17,7 +17,7 @@ OV.MeshInstanceId = class
     }
 };
 
-OV.MeshInstance = class extends OV.Object3D
+OV.MeshInstance = class extends OV.ModelObject3D
 {
     constructor (node, mesh)
     {
@@ -79,6 +79,21 @@ OV.MeshInstance = class extends OV.Object3D
         }
     }
 
+    PropertyGroupCount ()
+    {
+        return this.mesh.PropertyGroupCount ();
+    }
+
+    AddPropertyGroup (propertyGroup)
+    {
+        return this.mesh.AddPropertyGroup (propertyGroup);
+    }
+
+    GetPropertyGroup (index)
+    {
+        return this.mesh.GetPropertyGroup (index);
+    }
+
     GetTransformedMesh ()
     {
         let transformation = this.node.GetWorldTransformation ();
diff --git a/source/model/model.js b/source/model/model.js
index fa8f80b..7c7f85d 100644
--- a/source/model/model.js
+++ b/source/model/model.js
@@ -116,6 +116,26 @@ OV.Model = class extends OV.ModelObject3D
         return this.meshes[index];
     }
 
+    GetMeshInstance (instanceId)
+    {
+        let foundNode = null;
+        this.root.Enumerate ((node) => {
+            if (node.GetId () === instanceId.nodeId) {
+                foundNode = node;
+            }
+        });
+        if (foundNode === null) {
+            return null;
+        }
+        // TODO: check it when every model is hierarchical
+        // const nodeMeshIndices = foundNode.GetMeshIndices ();
+        // if (nodeMeshIndices.indexOf (instanceId.meshIndex) === -1) {
+        //     return null;
+        // }
+        let foundMesh = this.GetMesh (instanceId.meshIndex);
+        return new OV.MeshInstance (foundNode, foundMesh);
+    }
+
     EnumerateMeshes (onMesh)
     {
         for (const mesh of this.meshes) {
diff --git a/website/o3dv/js/treeview.js b/website/o3dv/js/treeview.js
index eb4c309..ca1ac19 100644
--- a/website/o3dv/js/treeview.js
+++ b/website/o3dv/js/treeview.js
@@ -66,9 +66,13 @@ OV.TreeViewSingleItem = class extends OV.TreeViewItem
         this.selected = selected;
         if (this.selected) {
             this.mainElement.addClass ('selected');
-            this.parent.ShowChildren (true, () => {
-                OV.ScrollToView (this.mainElement);
-            });
+            let parent = this.parent;
+            while (parent !== null) {
+                parent.ShowChildren (true, () => {
+                    OV.ScrollToView (this.mainElement);
+                });
+                parent = parent.parent;
+            }
         } else {
             this.mainElement.removeClass ('selected');
         }
diff --git a/website/o3dv/js/website.js b/website/o3dv/js/website.js
index d67a74c..d1ee3a1 100644
--- a/website/o3dv/js/website.js
+++ b/website/o3dv/js/website.js
@@ -697,7 +697,8 @@ OV.Website = class
                 this.detailsPanel.AddObject3DProperties (this.model);
             },
             onMeshSelected : (meshInstanceId) => {
-                this.detailsPanel.AddObject3DProperties (this.model.GetMesh (meshInstanceId.meshIndex));
+                let meshInstance = this.model.GetMeshInstance (meshInstanceId);
+                this.detailsPanel.AddObject3DProperties (meshInstance);
             },
             onMaterialSelected : (materialIndex) => {
                 this.detailsPanel.AddMaterialProperties (this.model.GetMaterial (materialIndex));