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This piece of code snippet will initially hide the primefaces dialog box, then in any action from the backing bean, it will be activated and seen
Back bean
RequestContext context = RequestContext.getCurrentInstance(); context.execute("PF('dlgBlackListVar').show();");
View
<p:dialog id="dlgBlackList" widgetVar="dlgBlackListVar" header="#{msg.member_blacklist_header}" showEffect="clip" modal="true" visible="false"> <h:outputText value="#{msg.member_blacklist_content}" /> </p:dialog>