values ​​loading XML file

HelloI have the followingxml fileloaded into apdf

myxml fileis structuredin this way:

<root>

     <list>

          <field code="A">

               <field1 code="100"  />

          </field>

          <field code="B">

               <field1 code="200"  />

          </field>

     </list>

</root>

In the firstdropdownlistI was able toload thefieldvalues​​(A, B, etc.)

  following this tutorial:http://forms.stefcameron.com/2006/07/29/dynamic-properties/

works well

the problem I havenowis how do Iloadin a seconddropdownlist, the values (100, 200) ​​from thexml fileaccording to thechoice madebefore?