diff --git a/bricks/header.tmpl b/bricks/header.tmpl
index c132027..8e6b1e3 100644
--- a/bricks/header.tmpl
+++ b/bricks/header.tmpl
@@ -5,7 +5,7 @@
     <meta http-equiv="X-UA-Compatible" content="IE=edge" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
 <link rel="stylesheet" href="{{entire_url('/bricks/3parties/xterm.css')}}" />
-<link rel="stylesheet" href="{{entire_url('/bricks/css/bricks.css')}}?v=20260815e">
+<link rel="stylesheet" href="{{entire_url('/bricks/css/bricks.css')}}?v=20260815f">
 <link rel="stylesheet" href="{{entire_url('/bricks/css/api_doc.css')}}">
 {% for mycss in cssfiles() %}
 <link rel="stylesheet" href="{{entire_url(mycss)}}">
@@ -37,7 +37,7 @@
   <script type="module"
     src="{{entire_url('/bricks/3parties/model-viewer.min.js')}}">
   </script>
-  <script src="{{entire_url('/bricks/bricks.js')}}?v=20260815e"></script>
+  <script src="{{entire_url('/bricks/bricks.js')}}?v=20260815f"></script>
 {% for myjs in jsfiles() %}
   <script src="{{entire_url(myjs)}}"></script>
 {% endfor %}
diff --git a/bricks/tree.js b/bricks/tree.js
index 7e165ca..cd6ab50 100644
--- a/bricks/tree.js
+++ b/bricks/tree.js
@@ -77,6 +77,7 @@ bricks.TreeNode = class extends bricks.VBox {
 			this.children_loaded = true;
 		}
 		this.container.show();
+		if (this.icon_w && this.icons_urls.open) this.icon_w.set_url(this.icons_urls.open);
 	}
 	collapse(){
 		this.node_state = 'close'
@@ -84,6 +85,7 @@ bricks.TreeNode = class extends bricks.VBox {
 			return;
 		}
 		this.container.hide();
+		if (this.icon_w && this.icons_urls.close) this.icon_w.set_url(this.icons_urls.close);
 	}
 	create_triple(){
 		return new bricks.StatedSvg({
@@ -126,15 +128,14 @@ bricks.TreeNode = class extends bricks.VBox {
 		} else {
 			icon_url = this.icons_urls.leaf;
 			if (this.is_leaf) icon_url = this.icons_urls.leaf;
-			else if (this.node_state == 'expand') this.icon_url = this.icons_urls.open;
-			else this.icon_url = this.icons_urls.close;
+			else if (this.node_state == 'open') icon_url = this.icons_urls.open;
+			else icon_url = this.icons_urls.close;
 		}
-		console.log('icons=', this.icons_urls, 'icon_url=', icon_url, this.user_data);
-		var img = new bricks.Svg({
+		this.icon_w = new bricks.Svg({
 			rate:1,
 			url:icon_url
 		});
-		widget.add_widget(img);
+		widget.add_widget(this.icon_w);
 		if (this.tree.node_view){
 			this.view_w = await bricks.widgetBuild(this.tree.node_view, widget, this.user_data);
 			if (this.view_w){
@@ -171,7 +172,7 @@ bricks.TreeNode = class extends bricks.VBox {
 		}
 		if (! icons){
 			icons = {
-				open: bricks_resource('imgs/open-folders.svg'),
+				open: bricks_resource('imgs/open-folder.svg'),
 				close: bricks_resource('imgs/close-folder.svg'),
 				leaf: bricks_resource('imgs/close-folder.svg')
 			};