NativeScript/apps/ui/app/bottom-navigation/first-page.ts

import { EventData } from '@nativescript/core/data/observable';
import { Button } from '@nativescript/core/ui/button';

export function goToSecond(args: EventData) {
	console.log('---> goToSecond Page');
	const button = <Button>args.object;
	button.page.frame.navigate('bottom-navigation/second-page');
}

export function goBack(args: EventData) {
	console.log('---> goBack');
	const button = <Button>args.object;
	button.page.frame.goBack();
}