MVC 2 Editor templates and complex viewmodels

Have a complex view model with nested models and can't get the real PropertyName from

ViewData.ModelMetadata.PropertyName

use

ViewData.TemplateInfo.HtmlFieldPrefix
ahh but this returns parentmodel.propertyName
so
ViewData.TemplateInfo.HtmlFieldPrefix.Replace(".","_")
done.
jquery date picker example:

$(document).ready(function() {
 $('#').datepicker({ yearRange: '-120:+5', dateFormat: 'dd/mm/yy', changeMonth: true, changeYear: true });
});