How to enable my radiobutton with primefaces - ajax

Question

enable/disable my selectOneRadio does not work like expected. It only activates after a "submit" and the ajax-direct approach does not work.
When I change the selection (click) to "Group", then the dropDown after the selection keeps being "disabled". It only appears after a "submit", but I like to have direct-ajax function.
<div>
<p:outputPanel id="customPanel" style="margin-bottom:10px">
<p:selectOneRadio id="locationType" value="#{bean.query.locationType}"
required="true" layout="custom">
<f:ajax render="locationGroup locationOrganization">
<f:selectItems value="#{bean.locationTypeSelectItems}"
var="locationTypeItem" itemValue="#{locationTypeItem}" itemLabel="#{msgs[locationTypeItem.label]}" />
</f:ajax>
</p:selectOneRadio>
<h:panelGrid columns="3" cellpadding="5">
<p:radioButton id="option1" for="locationType" itemIndex="0" />
<p:outputLabel for="locationGroup" value="Group"/>
<p:autoComplete id="locationGroup"
value="#{bean.query.locationGroup}"
completeMethod="#{bean.completeGroups}"
var="group"
itemLabel="#{group.description}"
itemValue="#{group}"
converter="org.company.project.presentation.group.GroupConverter"
maxResults="10"
dropdown="true"
cache="true"
disabled="#{bean.locationGroupDisabled}"/>
<p:radioButton id="option2" for="locationType" itemIndex="1" />
<p:outputLabel for="locationOrganization" value="#{msgs.pat_Organization}"/>
<p:autoComplete id="locationOrganization"
value="#{bean.query.locationOrganization}"
completeMethod="#{bean.completeOrganizations}"
var="organization"
itemLabel="#{organization.name}"
itemValue="#{organization}"
converter="org.company.project.presentation.organization.OrganizationConverter"
maxResults="10"
dropdown="true"
cache="true"
disabled="#{bean.locationOrganizationDisabled}"/>
<p:radioButton id="option3" for="locationType" itemIndex="2" />
<p:outputLabel value="All" />
</h:panelGrid>
<p:message for="locationGroup" />
<p:message for="locationOrganization" />
</p:outputPanel>
<p:message for="locationType" />
That's all folks!