title: Search multi select dropdown angular 4 and material 2
body: <p>Hi I am using angular 4 and material 2. I have a drop down with multi select options. I am able to display the dropdown with multi select option. Now I want to implement search/filter option in select dropdown. Could you please let me know, Is there any way to achieve this in material2 or I need to implement my own searchable component? Is there any thing like &lt; mat-select-header >?</p>