How can i prevent the Hotkey to be fired when the selects a value from the suggestionlist with hitting enter in the following example ?

<rich:hotKey selector="#searchclazz" key="return" handler="#{rich:element('startSearchButton')}.onclick();return false;"/>
<h:inputText id="searchclazz" value="#{TAOverview.searchclazz}" />
<rich:suggestionbox usingSuggestObjects="true" width="200" height="200" status="none"
 suggestionAction="#{TAOverview.autocompleteSearchKlasse}" var="klasse" for="searchclazz"
 id="suggest_searchclazz" tokens="," ajaxSingle="true">
 <h:column>
 <h:outputText value="#{klasse}" />
 </h:column>
</rich:suggestionbox>

I tried the following:
oncomplete="return false;"
oncomplete="Event.stop(event);"

Are there any other solutions ?
I am using Richfaces 3.3.2SR1 with MyFaces 1.2.5!