src/model.js
function(index) {
		if (!_.isNumber(index) || isNaN(index)) index = 0;
		if (index < 0) return this.getAllModels()[~index];

		var model = this;
		
		while (index && model) {
			model = model.parent;
			index--;
		}
		
		return model;
	}
function(index) {
		if (!_.isNumber(index) || isNaN(index)) index = 0;
		if (index < 0) return this.getAllModels()[~index];

		var model = this;
		
		while (index && model) {
			model = model.parent;
			index--;
		}
		
		return model;
	}
gets the model in the stack at the index negative values start at root