Angular 2 Nested Modal Dialog with PrimeNG doesn't work

You can solve this problem by appending the second dialog to the document body by using the appendTo attribute, e.g.

<p-dialog appendTo="body">
...
</p-dialog>

Defining a componentref variable and using [appendTo]="Componentref" solve the issue. See discussion https://github.com/primefaces/primeng/issues/656