Yack pack in TGEA 1.7.0

I followed the merge guide of the yack pack to change the code in the TGEA1.7.0,now i have a little confusion about some code ,like this:
I inserted the code after this
case KEY_DELETE:
if ( mSelectedCell.y >= 0 && mSelectedCell.y < mList.size() )
Con::executef( this, 2, "onDeleteKey", Con::getIntArg( mList[mSelectedCell.y].id ) );
break;
default:
with
//START YACK
if(mNotifyParentInput)
{
return( Parent::onKeyDown( event ) );
}
//END YACK
ok,is that i have to delect the code "return( Parent::onKeyDown( event ) ); "which originally exited in the code source?