Access an element in XAML markup?

Question

WPF

Have StackPanel

StackPanel sp = new StackPanel
            {
                Width = MainGrid.ActualWidth,
                Height = MainGrid.ActualWidth,
                
            };

How to refer to this instance in XAML markup?

Answer 1

By name: Name="".

Answer 2

If you dynamically add a control, then there is no way, because at first the XAML "constructor" works out, and then you add your own control and the "constructor" simply does not know anything about it. As an option, dynamically build XAML and pass it to the "constructor", but there are a lot of restrictions.