<mat-header-cell *matHeaderCellDef> Action </mat-header-cell>
<!-- click on button should not expand/collapse the row -->
<mat-cell *matCellDef="let element" (click)="$event.stopPropagation()">
<mat-header-cell *matHeaderCellDef> Action </mat-header-cell>
<!-- click on button should not expand/collapse the row -->
<mat-cell *matCellDef="let element" (click)="$event.stopPropagation()">