Dropdown with values from repeat

gistfile1.xml

<xh:html xmlns:xh="http://www.w3.org/1999/xhtml" xmlns:xf="http://www.w3.org/2002/xforms"
         xmlns:xs="http://www.w3.org/2001/XMLSchema"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns:ev="http://www.w3.org/2001/xml-events"
         xmlns:xi="http://www.w3.org/2001/XInclude"
         xmlns:xxi="http://orbeon.org/oxf/xml/xinclude"
         xmlns:xxf="http://orbeon.org/oxf/xml/xforms"
         xmlns:exf="http://www.exforms.org/exf/1-0"
         xmlns:fr="http://orbeon.org/oxf/xml/form-runner"
         xmlns:saxon="http://saxon.sf.net/"
         xmlns:sql="http://orbeon.org/oxf/xml/sql"
         xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"
         xmlns:fb="http://orbeon.org/oxf/xml/form-builder">
    <xh:head>
        <xh:title>Untitled Form</xh:title>
        <xf:model id="fr-form-model" xxf:expose-xpath-types="true">

            <!-- Main instance -->
            <xf:instance id="fr-form-instance" xxf:exclude-result-prefixes="#all">
                <form>
                    <children>
                        <child>
                            <child-iteration>
                                <first-name/>
                            </child-iteration>
                        </child>
                    </children>
                    <section-5>
                        <control-6/>
                    </section-5>
                </form>
            </xf:instance>

            <!-- Bindings -->
            <xf:bind id="fr-form-binds" ref="instance('fr-form-instance')">
                <xf:bind id="children-bind" name="children" ref="children">
                    <xf:bind id="child-bind" ref="child" name="child">
                        <xf:bind id="child-iteration-bind" ref="child-iteration" name="child-iteration">
                            <xf:bind id="first-name-bind" ref="first-name" name="first-name"/>
                        </xf:bind>
                    </xf:bind>
                </xf:bind>
                <xf:bind id="section-5-bind" ref="section-5" name="section-5">
                    <xf:bind id="control-6-bind" ref="control-6" name="control-6"/>
                </xf:bind>
            </xf:bind>

            <!-- Metadata -->
            <xf:instance xxf:readonly="true" id="fr-form-metadata" xxf:exclude-result-prefixes="#all">
                <metadata>
                    <application-name>a</application-name>
                    <form-name>a</form-name>
                    <title xml:lang="en">Untitled Form</title>
                    <description xml:lang="en"/>
                    <singleton>false</singleton>
                </metadata>
            </xf:instance>

            <!-- Attachments -->
            <xf:instance id="fr-form-attachments" xxf:exclude-result-prefixes="#all">
                <attachments>
                    <css mediatype="text/css" filename="" size=""/>
                    <pdf mediatype="application/pdf" filename="" size=""/>
                </attachments>
            </xf:instance>

            <!-- All form resources -->
            <!-- Don't make readonly by default in case a service modifies the resources -->
            <xf:instance id="fr-form-resources" xxf:readonly="false" xxf:exclude-result-prefixes="#all">
                <resources>
                    <resource xml:lang="en">
                        <control-6>
                            <label>Child</label>
                            <hint/>
                            <item>
                                <label>First choice</label>
                                <value>1</value>
                            </item>
                            <item>
                                <label>Second choice</label>
                                <value>2</value>
                            </item>
                            <item>
                                <label>Third choice</label>
                                <value>3</value>
                            </item>
                        </control-6>
                        <first-name>
                            <label>First name</label>
                            <hint/>
                        </first-name>
                        <children>
                            <label>Children</label>
                        </children>
                        <section-5>
                            <label>Select child</label>
                            <help/>
                        </section-5>
                        
                    </resource>
                </resources>
            </xf:instance>

            <!-- Utility instances for services -->
            <xf:instance id="fr-service-request-instance" xxf:exclude-result-prefixes="#all">
                <request/>
            </xf:instance>

            <xf:instance id="fr-service-response-instance" xxf:exclude-result-prefixes="#all">
                <response/>
            </xf:instance>
            <xf:instance xxf:readonly="true" id="child-template">
                <child-iteration>
                    <first-name/>
                </child-iteration>
            </xf:instance>

            <xf:instance id="echo-instance" class="fr-service" xxf:exclude-result-prefixes="#all">
                <body xmlns:secure="java:org.orbeon.oxf.util.SecureUtils"
                      xmlns:frf="java:org.orbeon.oxf.fr.FormRunner"
                      xmlns:p="http://www.orbeon.com/oxf/pipeline"
                      xmlns:fbf="java:org.orbeon.oxf.fb.FormBuilder">&lt;data/&gt;</body>
            </xf:instance>
            <xf:submission id="echo-submission" class="fr-service"
                           ref="instance('fr-service-request-instance')"
                           resource="http://xformstest.org/cgi-bin/echoinstance.sh"
                           method="post"
                           serialization="application/xml"
                           mediatype="application/xml"
                           replace="instance"
                           instance="fr-service-response-instance"/>
        </xf:model>
    </xh:head>
    <xh:body>
        <fr:view>
            <fr:body xmlns:xbl="http://www.w3.org/ns/xbl"
                     xmlns:oxf="http://www.orbeon.com/oxf/processors"
                     xmlns:p="http://www.orbeon.com/oxf/pipeline">
                <fr:section id="children-control" bind="children-bind">
                    <xf:label ref="$form-resources/children/label"/>
                    <fr:grid id="child-control" bind="child-bind" repeat="content" min="1"
                             template="instance('child-template')">
                        <xh:tr>
                            <xh:td>
                                <xf:input id="first-name-control" bind="first-name-bind">
                                    <xf:label ref="$form-resources/first-name/label"/>
                                    <xf:hint ref="$form-resources/first-name/hint"/>
                                    <xf:alert ref="$fr-resources/detail/labels/alert"/>
                        
                        
                                </xf:input>
                            </xh:td>
                        </xh:tr>
                    </fr:grid>
                </fr:section>
                <fr:section id="section-5-control" bind="section-5-bind">
                    <xf:label ref="$form-resources/section-5/label"/>
                    <fr:grid>
                        <xh:tr>
                            <xh:td>
                                <fr:dropdown-select1 xmlns:xxbl="http://orbeon.org/oxf/xml/xbl" id="control-6-control"
                                                     bind="control-6-bind">
                                    <xf:label ref="$form-resources/control-6/label"/>
                                    <xf:hint ref="$form-resources/control-6/hint"/>
                        
                                    <xf:alert ref="$fr-resources/detail/labels/alert"/>
                                    <xf:itemset ref="/form/children/child/child-iteration/first-name">
                                        <xf:label ref="."/>
                                        <xf:value ref="."/>
                                    </xf:itemset>
                                </fr:dropdown-select1>
                            </xh:td>
                        </xh:tr>
                    </fr:grid>
                </fr:section>
            </fr:body>
        </fr:view>
    </xh:body>
</xh:html>