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+#region License
+
+// Copyright (C) 2020 Reetus
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#endregion
+
+using System;
+using System.Collections.Specialized;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Interactivity;
+
+namespace ClassicAssist.UI.Misc
+{
+    public class ItemsControlSelectNewEntryBehaviour : Behavior<ItemsControl>
+    {
+        public static readonly DependencyProperty SelectedItemProperty =
+            DependencyProperty.Register( nameof( SelectedItem ), typeof( object ),
+                typeof( ItemsControlSelectNewEntryBehaviour ),
+                new FrameworkPropertyMetadata( default, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault ) );
+
+        public static readonly DependencyProperty TypeProperty = DependencyProperty.Register( nameof( Type ),
+            typeof( Type ), typeof( ItemsControlSelectNewEntryBehaviour ),
+            new FrameworkPropertyMetadata( null, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault ) );
+
+        public object SelectedItem
+        {
+            get => GetValue( SelectedItemProperty );
+            set => SetValue( SelectedItemProperty, value );
+        }
+
+        public Type Type
+        {
+            get => (Type) GetValue( TypeProperty );
+            set => SetValue( TypeProperty, value );
+        }
+
+        protected override void OnAttached()
+        {
+            base.OnAttached();
+
+            ( (INotifyCollectionChanged) AssociatedObject.Items ).CollectionChanged += OnCollectionChanged;
+        }
+
+        protected override void OnDetaching()
+        {
+            base.OnDetaching();
+
+            ( (INotifyCollectionChanged) AssociatedObject.Items ).CollectionChanged -= OnCollectionChanged;
+        }
+
+        private void OnCollectionChanged( object sender, NotifyCollectionChangedEventArgs e )
+        {
+            if ( !( sender is ItemCollection ) )
+            {
+                return;
+            }
+
+            if ( e.NewItems == null )
+            {
+                return;
+            }
+
+            object firstItem = e.NewItems[0];
+
+            if ( Type != null )
+            {
+                if ( firstItem.GetType() != Type )
+                {
+                    return;
+                }
+            }
+
+            SelectedItem = firstItem;
+        }
+    }
+}