Set Title of LayoutAnchorable

Apr 15 at 7:16 AM
Hey,
i want to set the title per C#.
The LayoutAnchorable isnt accessable from code, so i literate over the LayoutAnchorablePane which has a name...
foreach (var layoutAnchorable in lapProperties.Children)
                    {
                        layoutAnchorable.Title = "NEW TITLE";
                    }
But it doesnt work, why?

Thanks for your help and the great control.