How do you span columns in C#?

[Complete]

How do you span columns in C#?
In silverlight, suppose you have a grid, and this grid is in 3 columns.
and you want to add a UserControl to this grid but you want it to span all three
columns. How would that C# code look like?
Grid1.Children.Add(UserControl01);
But then what?
Grid1.Children.ElementAt(1).SetValue(Grid.SetRowSpan, 2); ??

 

[Complete]

Grid1.Children.Add(UserControl02);
Grid.SetColumnSpan(UserControl02, 3);

 

[LordOfLA]

Thanks for the update!