instances created by dojox.widget.Iterator have no way to see their data

[alex]

instances of dojox.widget.Iterator, today, have no way of knowing what the properties of the data items they're created from or and have no way to specify properties which they may be interested in. The attrs array is created by parsing "${...}" expressions, but there's no way to provide "seed" list of attributes, nor is the data item/store pair or data object ever stored as a property of instances.

These limitations, combined with an inability to provide a constructor method in markup (<script type="dojo/method"> declarations are gobbled by the class constructor), leave widget authors with little recourse.