diff --git a/samples/charts/data-pie-chart/others/src/EnergyGlobalDemand.ts b/samples/charts/data-pie-chart/others/src/EnergyGlobalDemand.ts
deleted file mode 100644
index 3d2ed388a..000000000
--- a/samples/charts/data-pie-chart/others/src/EnergyGlobalDemand.ts
+++ /dev/null
@@ -1,51 +0,0 @@
-export class EnergyGlobalDemandItem {
-    public constructor(init: Partial<EnergyGlobalDemandItem>) {
-        Object.assign(this, init);
-    }
-
-    public value: number;
-    public category: string;
-    public summary: string;
-
-}
-export class EnergyGlobalDemand extends Array<EnergyGlobalDemandItem> {
-    public constructor(items: Array<EnergyGlobalDemandItem> | number = -1) {
-        if (Array.isArray(items)) {
-            super(...items);
-        } else {
-            const newItems = [
-                new EnergyGlobalDemandItem(
-                {
-                    value: 37,
-                    category: `Cooling`,
-                    summary: `Cooling 37%`
-                }),
-                new EnergyGlobalDemandItem(
-                {
-                    value: 25,
-                    category: `Residential`,
-                    summary: `Residential 25%`
-                }),
-                new EnergyGlobalDemandItem(
-                {
-                    value: 12,
-                    category: `Heating`,
-                    summary: `Heating 12%`
-                }),
-                new EnergyGlobalDemandItem(
-                {
-                    value: 11,
-                    category: `Lighting`,
-                    summary: `Lighting 11%`
-                }),
-                new EnergyGlobalDemandItem(
-                {
-                    value: 15,
-                    category: `Other`,
-                    summary: `Other 15%`
-                }),
-            ];
-            super(...newItems.slice(0));
-        }
-    }
-}