title: Angular mat-table : - Sort icon missing on custom sort
body: <p>The mat-sort icon is not showing when we sort the mat table by code. How can do the sort on clicking the button rather than clicking on the mat- header.</p>
  
  <p><a href="https://stackblitz.com/edit/mattable-with-custom-sort?file=app%2Ftable-sorting-example.ts" rel="nofollow noreferrer">StackBlitzzzz Link</a></p>