Index: branches/5.1.x/core/admin_templates/img/icons/icon24_loading.gif
===================================================================
diff -u -N
Binary files differ
Index: branches/5.1.x/core/admin_templates/tree.tpl
===================================================================
diff -u -N -r13401 -r13436
--- branches/5.1.x/core/admin_templates/tree.tpl	(.../tree.tpl)	(revision 13401)
+++ branches/5.1.x/core/admin_templates/tree.tpl	(.../tree.tpl)	(revision 13436)
@@ -54,6 +54,11 @@
 			<script type="text/javascript">
 				var TREE_ICONS_PATH = 'img/tree';
 				var TREE_SHOW_PRIORITY = <inp2:m_if check="adm_ConstOn" name="DBG_SHOW_TREE_PRIORITY" debug_mode="1">1<inp2:m_else/>0</inp2:m_if>;
+				var TREE_LOADING_NODE = {
+					text: '<inp2:m_Phrase name="la_title_Loading"/>',
+					icon: '<inp2:adm_ModulePath module="core"/>img/icons/icon24_loading.gif'
+				};
+
 				<inp2:m_DefineElement name="root_node">
 					var the_tree = new TreeFolder('tree', '<inp2:m_param name="label"/>', '<inp2:m_param name="section_url"/>', '<inp2:$SectionPrefix_ModulePath module="$icon_module"/>img/icons/icon24_<inp2:m_param name="icon"/>.png', null, null, '<inp2:m_param name="priority"/>', '<inp2:m_param name="container"/>');
 				</inp2:m_DefineElement>
Index: branches/5.1.x/core/admin_templates/js/tree.js
===================================================================
diff -u -N -r13401 -r13436
--- branches/5.1.x/core/admin_templates/js/tree.js	(.../tree.js)	(revision 13401)
+++ branches/5.1.x/core/admin_templates/js/tree.js	(.../tree.js)	(revision 13436)
@@ -537,9 +537,12 @@
 }
 
 TreeFolder.prototype.successCallback = function ($request, $params, $object) {
-	if ($params == 'reload') {
+	/*if ($params == 'reload') {
 		$object.removeChildren();
-	}
+	}*/
+
+	$object.removeChildren(); // will also remove "Loading ..." node
+
 	$object.Loaded = true;
 	$object.ProcessXMLNode($request.responseXML);
 	$object.Render();
@@ -563,6 +566,10 @@
 
 	this.Reloading = true;
 
+	// add "Loading ..." node
+	this.AddLoadingNode();
+
+	// sending request to receive items
 	Request.headers['Content-type'] = 'text/xml';
 	Request.makeRequest(this.LateLoadURL, false, '', this.successCallback, this.errorCallback, 'reload', this);
 }
@@ -590,6 +597,10 @@
 	}
 	if (mode == 0) {
 		if (this.LateLoadURL && !this.Loaded) {
+			// add "Loading ..." node
+			this.AddLoadingNode();
+
+			// sending request to receive items
 			Request.headers['Content-type'] = 'text/xml';
 			Request.makeRequest(this.LateLoadURL, false, '', this.successCallback, this.errorCallback, '', this);
 		}
@@ -602,6 +613,16 @@
 	this.Expanding = false;
 }
 
+TreeFolder.prototype.AddLoadingNode = function() {
+	// remove all current children (including "Loading ...")
+	this.removeChildren();
+
+	// add "Loading ..." node
+	var $loading_item = this.AddItem(new TreeItem(TREE_LOADING_NODE.text, '#', TREE_LOADING_NODE.icon, '', 1), true);
+	this.locateTopItem().updateLastNodes();
+	$loading_item.display();
+}
+
 TreeFolder.prototype.collapse = function(mode)
 {
 	if (!isset(mode)) mode = 0;