Help: How do I iterate and submit to the server? works with struts not ww

I recently converted from Struts to webwork but am now encountering problem with the difference between the two. In struts, we can use a [b]nested:iterate[/b] tag in conjunction with a [b]nested:input[/b] tag to submit nested values to the server. The generated html will append [index] to the end of the parameter name and struts translate that to the list but doing a list.get(index).setProperty().

I attemped the same with Webwork but the values always fails to submit:

<ww:form name="save" namespace="sample" action="toy!save.action" validate="false" method="POST">
<ww:iterator value="toyList" id="test">
	<ww:property value="toyId" />
	<ww:textfield  label="Size" name="size" />
</ww:iterator>
<ww:submit value="Save" />
</ww:form>

Basically, I have a list of toys that I want to update their size all at once.  Any help is appreciated.

ERRORS:
03:44:43,418 ERROR [[webwork]] Servlet.service() for servlet webwork threw exception
java.lang.RuntimeException: No object in the CompoundRoot has a property named 'size'.
	at com.opensymphony.xwork.util.CompoundRootAccessor.setProperty(CompoundRootAccessor.java:67)
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