I have (according to some other answers I found here) the following:
<a4j:outputPanel id="qualSelectorWrapper" ajaxRendered="true">
<h:selectOneMenu id="qualSelector" value="#{xmlCreator.qualFilename}" disabled="#{!xmlCreator.qualFileEnabled}">
<f:selectItems value="#{si:toSelectFileList(appController.directoryContents)}"/>
</h:selectOneMenu>
</a4j:outputPanel>
<h:selectBooleanCheckbox value="#{xmlCreator.qualFileEnabled}">
<a4j:support event="onclick" reRender="qualSelector"/>
</h:selectBooleanCheckbox>
unfortunatly, clicking the checkbox does absolutely nothing. What am I doing wrong?