How do you span columns in C#?

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(U开发者_如何学编程serControl01);

But then what?

Grid1.Children.ElementAt(1).SetValue(Grid.SetRowSpan, 2);

??

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I think you want something like this:

Grid1.Children.Add(UserControl01);
Grid.SetColumnSpan(UserControl01, 3);

MSDN Docs: http://msdn.microsoft.com/en-us/library/system.windows.controls.grid.setcolumnspan.aspx