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By: adnche

i solve this issue
the example doesnt work because they use their own type of List (TestList) i
think wich has a (getItem) method
this is whtat i did to get the nested tables work usign an arrayList 

First i declare the appropiate import to make the Cast 
<[EMAIL PROTECTED] import="com.adnsystems.komori.portal.Expense"%>

then at the top of the jsp I had to declare the list 
<jsp:useBean id="myList" scope="request" class="java.util.ArrayList"/>

and the inside my table i declare the nested table

 <display:column title="Title">
        <display:table name="<%=((Expense)myList.get(parent_rowNum.intValue()
-1)).getSubList()%>" >
                <display:column property="description" title="Description" />
                <display:column property="mount" />             
        </display:table>
  </display:column>

i hope this help someone 
if somebody has a better idea please pos it

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