Person.View.js

gistfile1.js

YUI.add('personView',function(Y){
	Y.PersonView = Y.Base.create(
		'personView', 
		Y.View, 
		[], 
		{
			initializer:function(){
				this.model = this.get('model');
			},
			render:function(){
				if (this.template) {
					this.get('container').setHTML(this.template(this.model.getAttrs(['name','age','height'])));
				} else {
					Y.io('/scripts/views/templates/Person.Template.html',{
						on:{
							complete:function(id,response){
								this.template = Y.Handlebars.compile(response.responseText);
								this.render();
							}
						},
						context:this
					});
					
				}
				return this;
			}
		});
	}, '0.0.1', {
	requires: ['base-build','handlebars', 'io-base','node-base','view', 'personModel']
});

Creo que todavía te faltaría evitar alguna race condition si se llama a render() muy rápido