In my app, I have a mat-form-field with a mat- option. I want a dialog to open when I select an element from the mat-option. Here is my code. Right now, when I select an element, nothing happens. What should I do?

HTML:

                <ng-container matColumnDef="Order">
                    <th mat-header-cell *matHeaderCellDef width="10%"> Sipariş No </th>
                    <td mat-cell *matCellDef="let row; let i = index">
                        <span *ngIf="EditIndex != i">{{row.Order?.Subject}}</span>
                        <mat-form-field floatLabel="never" *ngIf="EditIndex == i" class="w-100-p" style="min-width: 100px !important;">
                            <mat-select [(ngModel)]="row.Order" required name="Order"
                                (selectionChange)="updateProducts($event.value)" style="min-width: 100px !important;">
                                <mat-select-trigger>
                                    {{row?.Order?.Reference}}
                                </mat-select-trigger>
                                <mat-option *ngFor="let order of originalSupplierOrders" [value]="order">
                                    {{order.Reference + ' - ' + order.Subject}}
                                </mat-option>
                            </mat-select>
                        </mat-form-field>
                    </td>
                </ng-container>

TS:

openSelectedOrderProductList(prm) {
    const dialogRef = this._dialog.open(SelectedOrderProductListDialogComponent, {
        width: "700px",
        data: prm,
    });

    dialogRef.afterClosed().subscribe((result) => {
        //console.log(result);
    });
}