Beyond “Because I said so!”

Q: There are times when I have to say no to something my child wants, but I’m not sure how to handle it when my child gets upset. Sometimes I just give in and let her have what she wants, but that doesn’t feel right and it makes it harder the next time I need to say no. I hate seeing her so mad. My parents always used to say, “Because I said so!” after they used the word no with me, but I’d like to do things differently. Any suggestions?