PrimeNG TreeTable cannot get Row index

Trying to use rowIndex inside TreeTable. With DataTable rowIndex works fine, but with TreeTable rowIndex is undefined.

<p-treeTable [value]="files1">
<p-header>Basic</p-header>
<p-column header="ID">
<ng-template let-rowIndexValue="rowIndex" pTemplate="body">
<p class="rw-center-align">{{rowIndexValue}}</p>
</ng-template>
</p-column>
<p-column field="name" header="Name"></p-column>
<p-column field="size" header="Size"></p-column>
<p-column field="type" header="Type"></p-column>
<p-column header="Actions">
<ng-template let-rowIndexValue="rowIndex" pTemplate="body">
<button pButton label="Add child" (click)="addChild(rowIndex)"></button>
</ng-template>
</p-column>
</p-treeTable>


Here in addChild() method I'm getting rowIndexValue as undefined, and ID column is empty.

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