How to bind a read-only WPF control property (eg ActualWidth) so its value is accessible in the view model? [duplicate]

Answer 1

do you really need a binding for that?

    class MyVM
    {
        FrameworkElement _context;

        public MyVM(FrameworkElement context)
        {
            _context = context;
        }

        public double Width
        {
            get { return _context.ActualWidth; }
        }
    }