code: function SimpleFlatModel(items, idPrefix, getKey) {
  		this.items = items;
  		this.getKey = getKey;
  		this.idPrefix = idPrefix;
  		this.root = {children: items};
  	}
docs: Creates a new flat model based on an array of items already known.
  
  @name orion.explorer.SimpleFlatModel
  @param {Array} items the items in the model
  @param {String} idPrefix string used to prefix generated id's
  @param {Function} getKey function used to get the property name used for generating an id in the model