NativeScript · edusperoni · Sep 3, 2026
diff --git a/packages/core/ui/core/properties/index.ts b/packages/core/ui/core/properties/index.ts
@@ -669,7 +669,7 @@ export class InheritedProperty<T extends ViewBase, U> extends Property<T, U> imp
 						const childValueSource = child[sourceKey] || ValueSource.Default;
 						if (reset) {
 							if (childValueSource === ValueSource.Inherited) {
-								setFunc.call(child, unsetValue);
+								setInheritedValue.call(child, unsetValue);
 							}
 						} else {
 							if (childValueSource <= ValueSource.Inherited) {

diff --git a/packages/core/ui/core/properties/inherited-property.spec.ts b/packages/core/ui/core/properties/inherited-property.spec.ts
@@ -0,0 +1,141 @@
+import { describe, it, expect } from 'vitest';
+
+import { InheritedProperty, unsetValue } from './index';
+import { StackLayout } from '../../layouts/stack-layout';
+import { Label } from '../../label';
+
+// Mirrors the private `ValueSource` enum in ./index.
+const ValueSource = {
+	Default: 0,
+	Inherited: 1,
+	Css: 2,
+	Local: 3,
+};
+
+class TestView extends StackLayout {
+	public testInherited: string;
+
+	public createNativeView(): Object {
+		return {};
+	}
+}
+
+const testInheritedProperty = new InheritedProperty<TestView, string>({
+	name: 'testInherited',
+	defaultValue: undefined,
+});
+testInheritedProperty.register(TestView);
+
+function valueSourceOf(view: any): number {
+	return view[testInheritedProperty.sourceKey] || ValueSource.Default;
+}
+
+function tree(): { root: TestView; child: TestView; grandChild: TestView } {
+	const root = new TestView();
+	const child = new TestView();
+	const grandChild = new TestView();
+
+	root.addChild(child);
+	child.addChild(grandChild);
+
+	return { root, child, grandChild };
+}
+
+function recordChanges(view: any, eventName: string): unknown[] {
+	const values: unknown[] = [];
+	view.on(eventName, (data: any) => values.push(data.value));
+
+	return values;
+}
+
+describe('InheritedProperty', () => {
+	it('propagates a value down the tree', () => {
+		const { root, child, grandChild } = tree();
+
+		root.testInherited = 'a';
+
+		expect(child.testInherited).toBe('a');
+		expect(grandChild.testInherited).toBe('a');
+		expect(valueSourceOf(root)).toBe(ValueSource.Local);
+		expect(valueSourceOf(child)).toBe(ValueSource.Inherited);
+		expect(valueSourceOf(grandChild)).toBe(ValueSource.Inherited);
+	});
+
+	it('resets inheriting descendants when the value is unset', () => {
+		const { root, child, grandChild } = tree();
+		root.testInherited = 'a';
+
+		const childChanges = recordChanges(child, 'testInheritedChange');
+		const grandChildChanges = recordChanges(grandChild, 'testInheritedChange');
+
+		root.testInherited = unsetValue;
+
+		expect(root.testInherited).toBeUndefined();
+		expect(child.testInherited).toBeUndefined();
+		expect(grandChild.testInherited).toBeUndefined();
+		expect(valueSourceOf(root)).toBe(ValueSource.Default);
+		expect(valueSourceOf(child)).toBe(ValueSource.Default);
+		expect(valueSourceOf(grandChild)).toBe(ValueSource.Default);
+		expect(childChanges).toEqual([undefined]);
+		expect(grandChildChanges).toEqual([undefined]);
+	});
+
+	it("resets inheriting descendants when the value is set to 'initial'", () => {
+		const { root, child, grandChild } = tree();
+		root.testInherited = 'a';
+
+		root.testInherited = <any>'initial';
+
+		expect(child.testInherited).toBeUndefined();
+		expect(grandChild.testInherited).toBeUndefined();
+	});
+
+	it('leaves a descendant that holds a local value untouched', () => {
+		const { root, child, grandChild } = tree();
+		root.testInherited = 'a';
+		child.testInherited = 'local';
+
+		root.testInherited = unsetValue;
+
+		expect(child.testInherited).toBe('local');
+		expect(valueSourceOf(child)).toBe(ValueSource.Local);
+		expect(grandChild.testInherited).toBe('local');
+		expect(valueSourceOf(grandChild)).toBe(ValueSource.Inherited);
+	});
+
+	it('propagates again after a reset', () => {
+		const { root, child, grandChild } = tree();
+		root.testInherited = 'a';
+		root.testInherited = unsetValue;
+
+		root.testInherited = 'b';
+
+		expect(child.testInherited).toBe('b');
+		expect(grandChild.testInherited).toBe('b');
+		expect(valueSourceOf(grandChild)).toBe(ValueSource.Inherited);
+	});
+});
+
+describe('bindingContext', () => {
+	it('is reset on descendants when the root unsets it', () => {
+		const root = new StackLayout();
+		const container = new StackLayout();
+		const label = new Label();
+		root.addChild(container);
+		container.addChild(label);
+
+		const context = { name: 'a' };
+		root.bindingContext = context;
+		expect(container.bindingContext).toBe(context);
+		expect(label.bindingContext).toBe(context);
+
+		const labelChanges = recordChanges(label, 'bindingContextChange');
+
+		root.bindingContext = unsetValue;
+
+		expect(root.bindingContext).toBeUndefined();
+		expect(container.bindingContext).toBeUndefined();
+		expect(label.bindingContext).toBeUndefined();
+		expect(labelChanges).toEqual([undefined]);
+	});
+});