TreeView: update createChildren (#7151) (#7153)

Author: vladaskorohodova

api-reference/10 UI Components/dxTreeView/1 Configuration/createChildren.md

@@ -144,6 +144,20 @@ The following code shows how to use this function with a remote service:
     href: "https://js.devexpress.com/Demos/WidgetsGallery/Demo/Tree_View/LoadDataOnDemand/"
 }
 
+[note]
+
+To reset the TreeView's state after running **createChildren**, modify or clear [items](/Documentation/ApiReference/UI_Components/dxTreeView/Configuration/items/) array:
+
+        const items = treeViewInstance.option("items");
+        // Make necessary changes to items
+        treeViewInstance.option("items", items);
+
+        // or
+
+        treeViewInstance.option("items", []); 
+
+[/note]
+
 #####See Also#####
 - [Enhance Performance on Large Datasets](/concepts/05%20UI%20Components/TreeView/32%20Enhance%20Performance%20on%20Large%20Datasets.md '/Documentation/Guide/UI_Components/TreeView/Enhance_Performance_on_Large_Datasets/')
 - [Demo: Simple Array - Plain Structure](https://js.devexpress.com/Demos/WidgetsGallery/Demo/TreeList/SimpleArrayPlainStructure/)