Panel (show confirm dialog before close)

[aka]

Code: Select all

<p:panel id="myPanelId" header="Widget" closable="true" widgetVar="panel">
 
        <p:ajax event="close" listener="#{panelView.onClose}" update="msgs" />

 
        // content
</p:panel>

How to show confirmation dialog before close panel?
There is no 'beforeClose' event for panel...maybe someone have already done something like this?