MARKUS

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows;

namespace KCOM.Behaviors

{

    public class CustomWindowStateBehavior : System.Windows.Interactivity.Behavior<System.Windows.Window>

    {

        protected override void OnAttached()

        {

            AssociatedObject.StateChanged += AssociatedObject_StateChanged;

            base.OnAttached();

        }

        private void AssociatedObject_StateChanged(object sender, EventArgs e)

        {

            if(AssociatedObject.WindowState == WindowState.Maximized)

            {

                AssociatedObject.WindowState = WindowState.Normal;

                AssociatedObject.SetValue(CustomStateProperty, WindowState.Maximized);

            }

        }

        protected override void OnDetaching()

        {

            AssociatedObject.StateChanged += AssociatedObject_StateChanged;

            base.OnDetaching();

        }

        public static WindowState GetCustomState(DependencyObject obj)

        {

            return (WindowState)obj.GetValue(CustomStateProperty);

        }

        public static void SetCustomState(DependencyObject obj, WindowState value)

        {

            obj.SetValue(CustomStateProperty, value);

        }

        public static readonly DependencyProperty CustomStateProperty = DependencyProperty.RegisterAttached("CustomState", typeof(WindowState),

                                                                    typeof(Window), new FrameworkPropertyMetadata(WindowState.Normal, new PropertyChangedCallback(ApplicationCenterPropertyChanged)));

        private static void CustomStatePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)

        {

        }

    }

}