Displaying messagebox from backing bean

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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>