dialog ref issues

give ? for datatable.  
<a *ngIf="dsApproveAFI?.data?.length && dsApproveAFI.data[0]?.WorkFlow_ID"

    (click)="openWorkflowDialog(dsApproveAFI.data[0].WorkFlow_ID.toString())"

    style="cursor: pointer; text-decoration: underline; color: #006ab4;">

    {{ dsApproveAFI.data[0].WorkFlow_ID }}

 </a>