I can sucessfulley launch a tooltip with the following code

<rich:panel id="sample1" styleClass="tooltip-text">
 <rich:toolTip event="onclick" direction="bottom-right" layout="block">
 <span style="background-color: yellow">
 My tooltip message
 </span>
 </rich:toolTip>
 show
</rich:panel>

However the tooltip disapears when the user moves the mouse. I want the tooltip to stay until the user clicks the link again. Can this be done?
Thanks
Charles