jsf - p:megaMenu open with p:commandButton click event -

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in primefaces 5.1 want p:megamenu click open menu otherwise p:commandbutton press open it?

<p:megamenu  id="navigationmegamenuid"                   styleclass="navigationmenucolor"                   orientation="horizontal"                    autodisplay="false">                     ......... </p:megamenu>  <p:commandbutton value="open menu"/>


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