Build an Angular component that implements a Dropdown with template

import {Component, Input, Output, EventEmitter} from 'angular2/core';

@Component({
    selector: 'dropdown',
    template: `
      <div>
        <button (click)="toggleDropdown()">Toggle</button>
        <div [hidden]="dropdownHidden">
          <ng-content></ng-content>
        </div>
      </div>
    `
})
export class DropdownComponent {
    @Input()
    dropdownHidden = true;

    @Output()
    toggle: EventEmitter<any> = new EventEmitter();

    toggleDropdown() {
        this.dropdownHidden = !this.dropdownHidden;
        this.toggle.emit(null);
    }
}