title: Keep the dropdown open always in angular2-multiselect-dropdown
body: <p>I am using angular2-multiselect-dropdown in angular. I am using it in a popup. Now when i click a button, I want the popup to show the dropdown in open mode. I dont want to again select the down arrow in it. </p>
  
  <pre><code>      &lt;angular2-multiselect [data]="columns" 
                        [(ngModel)]="selectedItems" 
                        [settings]="settings" 
                        (onSelect)="onItemSelect($event)"
                        (onDeSelect)="OnItemDeSelect($event)" 
                        (onSelectAll)="onSelectAll($event)" 
                        (onDeSelectAll)="onDeSelectAll($event)"&gt;
  &lt;/angular2-multiselect&gt;
  </code></pre>