EditorViewData does not work for popup edit mode. But there are situations where we need to pass view data for a specific editor, like we can in InCell and InLine edit modes. Unfortunately there is currently no easy way to do this.
It has been suggested to use AdditionalViewData or create a custom popup editor, but AdditionalViewData values would be the same for each widget inside the popup editor, and creating a custom popup editor for each and every grid we use would be cumbersome. So I ask that you please seriously consider this feature request.