to customize icon for toggler we provide openMarker and closeMarker facets. But it seems a bug while working with customized simpletogglepanel. I inform you about bugs to be posted. Thanks!

http://jira.jboss.com/jira/browse/RF-255
http://jira.jboss.com/jira/browse/RF-254

Thanks for the submit.

In Jira page, it says it is fixed in 3.0.2.

How can I find version 3.0.2?

The next version will be 3.1.0. It is not released yet. The SNAPSHOTs are available at:
http://maven.exadel.com/org/richfaces/ui/richfaces-ui/3.1.0-SNAPSHOT/

Is it possible to make the toggle icon appear on the left side of the header?

<style>
 .head div { float:left !important; }
</style>
....
<rich:simpleTogglePanel headerClass="head" label="FooBar">

 <f:facet name="closeMarker">
 <h:outputText value="^"/>
 </f:facet>
 <f:facet name="openMarker">
 <h:outputText value="v"/>
 </f:facet>

 Content here
</rich:simpleTogglePanel>