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primefaces - show p:modalPanel from java backing bean / controller class and update specific id or collection of id strings

here's how you show a p:modalPanel from a java backing bean call:

"modalPanelWV" is the widgetVar value, e.g.:
<p:modalPanel id="myModalPanel" widgetVar="myModalPanelWV" ...

update an id from backing bean:

OR update a Collection<String> of IDs:

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