title: Primeng - How to add a button inside the header of a multi-select/dropdown?
body: <p>I would like to add a button somewhere inside the header of the multiselect component so user can click that button instead of relying on the onChange event of the <a href="https://www.primefaces.org/primeng/#/multiselect" rel="nofollow noreferrer">multiselect</a> component.</p>
  
  <p>On the documentation, there are only a couple of pre-defined directive.</p>
  
  <p><code>pTemplate="selectedItems"</code> and <code>pTemplate="item"</code> to edit the template. How to i add custom html aside from those two. I would like to add the button besides the search input form?</p>