context: proto._findPropertyEditor = function(className, propertyName) {	// get all defined propertyEditors for this widget's prototype	var m = this._propertyEditors[className];	// lookup the converter for this property name	if (m && m[propertyName]) {		return m[propertyName];	};	// try the widget's superclass	var w = window[className];	if (w && w.prototype.superclass && w.prototype.superclass.prototype.classname) {		return this._findPropertyEditor(w.prototype.superclass.prototype.classname, propertyName);	};		return null;};
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