How to set an initial value for a user control property?

I am creating a custom user control and I am wondering how do you set an initial value for a property during design time? I have a property called Alignment that has 4 enum values TopRight, TopLeft, BottomRight and BottomLeft. So, when a user drops the user control onto a Form, I want the initial value of the property to be always BottomRight. How can I do this?