Change origin of UserControl placed in a Canvas

I have a UserControl that I'm positioning on a Canvas control using Canvas.Left() and Canvas.Top(). By default the origin of the UserControl is top left (0,0). How can I move the o开发者_StackOverflow中文版rigin of the UserControl to be bottom left?

For that you can use the Bottom attached property, instead of the Top. You can still use the Left property, like you are.