Меню материалов внутри ng-template не работает

<span *ngIf = "!slot.teiletyp.finished; else finishedPart" mat-line>
                Charge: {{ queue.box.batch_number }}
                </span>
                <ng-template #finishedPart>
                        <span mat-line >Fertigteilbox</span>
                        <mat-menu #menu = "matMenu">
                        <button mat-menu-item (click) = "boxClicked(queue.box)">boxdetail</button>
                        <button mat-menu-item (click) = "openBoxes(queue.box.id)">offenebox</button>
                        </mat-menu>
                </ng-template>

here i am trying to open a menu in the else part but i am unable to doso. can someone help me with this.

Спасибо