Really easy question (I hope).

<rich:column colspan="3" breakBefore="true" rendered="#{eachResource == 'YARD' || eachResource == 'INDOOR_STABLE'}">
 <rich:inputNumberSpinner enableManualInput="false" minValue="1" maxValue="25" step="1" rendered="#{eachResource == 'YARD'}" value="#{bookingController.yardNumbers}"/>
 <a4j:support event="onchange" reRender="resourceAddedTable, resourcesAddedTotal" />
 <rich:inputNumberSpinner enableManualInput="false" minValue="1" maxValue="25" step="1" rendered="#{eachResource == 'INDOOR_STABLE'}" value="#{bookingController.stableNumbers}"/>
 <a4j:support event="onchange" reRender="resourceAddedTable, resourcesAddedTotal" />
</rich:column>

I am trying to get some "back end" method called when the value of the spinner changes in Seam but can't figure out the incantation.

I have breakpoints in the setStableNumbers() call but it never gets called.

Anyone?