NativeScript/tests/app/xml-declaration/mymodule/MyControl.ts

import { StackLayout, Label, Button, EventData } from "@nativescript/core";

export class MyControl extends StackLayout {
    constructor() {
        super();

        var counter: number = 0;

        var lbl = new Label();
        var btn = new Button();
        btn.text = "Tap me!";
        btn.on(Button.tapEvent, (args: EventData) => {
            lbl.text = "Tap " + counter++;
        });

        this.addChild(lbl);
        this.addChild(btn);

        this.className = "MyStackLayout";
    }
}