From 3dabb1e731966b78bd9fb177e0bbe6c0222c0cb6 Mon Sep 17 00:00:00 2001
From: tishko0 <phelbs@gmail.com>
Date: Sun, 11 Jan 2026 20:28:46 +0200
Subject: [PATCH] fix(tree-grid): update data due to unique id issue

---
 .../data-exporting-indicator/src/OrdersData.ts | 18 +++++++++---------
 .../data-exporting-indicator/src/index.ts      | 12 ++++++++++--
 2 files changed, 19 insertions(+), 11 deletions(-)

diff --git a/samples/grids/tree-grid/data-exporting-indicator/src/OrdersData.ts b/samples/grids/tree-grid/data-exporting-indicator/src/OrdersData.ts
index 88d4a9833f..3b4fccdac9 100644
--- a/samples/grids/tree-grid/data-exporting-indicator/src/OrdersData.ts
+++ b/samples/grids/tree-grid/data-exporting-indicator/src/OrdersData.ts
@@ -3,15 +3,15 @@ export class OrdersTreeDataItem {
         Object.assign(this, init);
     }
 
-    public ID: number;
-    public ParentID: number;
-    public Name: string;
-    public Category: string;
-    public OrderDate: string;
-    public Units: number;
-    public UnitPrice: number;
-    public Price: number;
-    public Delivered: boolean;
+    public ID!: number;
+    public ParentID!: number;
+    public Name!: string;
+    public Category!: string;
+    public OrderDate!: string;
+    public Units!: number;
+    public UnitPrice!: number;
+    public Price!: number;
+    public Delivered!: boolean;
 
 }
 export class OrdersTreeData extends Array<OrdersTreeDataItem> {
diff --git a/samples/grids/tree-grid/data-exporting-indicator/src/index.ts b/samples/grids/tree-grid/data-exporting-indicator/src/index.ts
index 4d85491714..637e137959 100644
--- a/samples/grids/tree-grid/data-exporting-indicator/src/index.ts
+++ b/samples/grids/tree-grid/data-exporting-indicator/src/index.ts
@@ -11,10 +11,18 @@ export class Sample {
 
     constructor() {
         const localData: any[] = [];
+        let idOffset = 0;
         for (let i = 0; i < 10000; i += 3) {
             for (let c = 0; c < this.ordersTreeData.length; c++) {
-                localData.push(this.ordersTreeData[c]);
+                const item = this.ordersTreeData[c];
+                const newItem = {
+                    ...item,
+                    ID: item.ID + idOffset,
+                    ParentID: item.ParentID === -1 ? -1 : item.ParentID + idOffset
+                };
+                localData.push(newItem);
             }
+            idOffset += 10000;
         }
 
         var treeGrid = document.getElementById('treeGrid') as IgcTreeGridComponent;
@@ -30,7 +38,7 @@ export class Sample {
         });
     }
 
-    private _ordersTreeData: OrdersTreeData = null;
+    private _ordersTreeData: OrdersTreeData | null = null;
     public get ordersTreeData(): OrdersTreeData {
         if (this._ordersTreeData == null)
         {