Android - Ocultar Divider de un Dialog

DialogDivider.java

final Dialog dialog = new Dialog(getActivity());
				dialog.setContentView(R.layout.dialog_regemail);
				dialog.getWindow().setBackgroundDrawableResource(android.R.color.transparent);
				//HACK PARA ELIMINAR DIVIDER DE UN DIALOG
				int dividerId = dialog.getContext().getResources().getIdentifier("android:id/titleDivider", null, null);
				View divider = dialog.findViewById(dividerId);
				divider.setBackgroundColor(getResources().getColor(android.R.color.transparent));
				//CONTROLES DENTRO DEL DIALOG
			Button btnRegistrar = (Button) dialog.findViewById(R.id.btnRegistrar);
				//LISTENER DE BOTÓN DEL DIALOG
				btnRegistrar.setOnClickListener(new OnClickListener() {
					@Override
					public void onClick(View v) {
						dialog.dismiss();
					}
				});
				dialog.show();
			}