title: Is there a way to add a function on close of ng-multiselect-dropdown?
body: <p>I am using the <a href="https://github.com/NileshPatel17/ng-multiselect-dropdown" rel="nofollow noreferrer">ng-multiselect-dropdown</a> package in angular 5 for creating a multi-select dropdown. 
  I want to do call a function on close or hide of the drop-down component. </p>
  
  <p>like  this</p>
  
  <pre><code>closeDropdown : function(){
     console.log("dropdown close triggered");
  }
  </code></pre>