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diff --git a/source/ShiftUI/Internal/ArrangedElementCollection.cs b/source/ShiftUI/Internal/ArrangedElementCollection.cs
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+//
+// ArrangedElementCollection.cs
+//
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject to
+// the following conditions:
+// 
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//
+// Copyright (c) 2006 Jonathan Pobst
+//
+// Authors:
+//	Jonathan Pobst ([email protected])
+//
+
+using System.Collections;
+using System;
+
+namespace ShiftUI.Layout
+{
+	public class ArrangedElementCollection : IList, ICollection, IEnumerable
+	{
+		internal ArrayList list;
+
+		internal ArrangedElementCollection ()
+		{
+			this.list = new ArrayList ();
+		}
+
+		#region Public Properties
+		public virtual int Count { get { return list.Count; } }
+		public virtual bool IsReadOnly { get { return list.IsReadOnly; } }
+		#endregion
+
+		#region Public Methods
+		public void CopyTo (Array array, int index)
+		{
+			list.CopyTo (array, index);
+		}
+
+		public override bool Equals (object obj)
+		{
+			if (obj is ArrangedElementCollection && this == obj)
+				return (true);
+			else
+				return (false);
+		}
+
+		public virtual IEnumerator GetEnumerator ()
+		{
+			return list.GetEnumerator ();
+		}
+
+		public override int GetHashCode ()
+		{
+			return base.GetHashCode ();
+		}
+		#endregion
+
+		#region IList Members
+		int IList.Add (object value)
+		{
+			return Add (value);
+		}
+
+		internal int Add (object value)
+		{
+			return list.Add (value);
+		}
+
+		void IList.Clear ()
+		{
+			Clear ();
+		}
+
+		internal void Clear ()
+		{
+			list.Clear ();
+		}
+
+		bool IList.Contains (object value)
+		{
+			return Contains (value);
+		}
+
+		internal bool Contains (object value)
+		{
+			return list.Contains (value);
+		}
+
+		int IList.IndexOf (object value)
+		{
+			return IndexOf (value);
+		}
+
+		internal int IndexOf (object value)
+		{
+			return list.IndexOf (value);
+		}
+
+		void IList.Insert (int index, object value)
+		{
+			throw new NotSupportedException ();
+		}
+
+		internal void Insert (int index, object value)
+		{
+			list.Insert (index, value);
+		}
+
+		bool IList.IsFixedSize {
+			get { return this.IsFixedSize; }
+		}
+
+		internal bool IsFixedSize {
+			get { return list.IsFixedSize; }
+		}
+
+		void IList.Remove (object value)
+		{
+			Remove (value);
+		}
+
+		internal void Remove (object value)
+		{
+			list.Remove (value);
+		}
+
+		void IList.RemoveAt (int index)
+		{
+			list.RemoveAt (index);
+		}
+
+		internal void InternalRemoveAt (int index)
+		{
+			list.RemoveAt (index);
+		}
+
+		object IList.this[int index] {
+			get { return this[index]; }
+			set { this[index] = value; }
+		}
+
+		internal object this[int index] {
+			get { return list[index]; }
+			set { list[index] = value; }
+		}
+		#endregion
+
+		#region ICollection Members
+		bool ICollection.IsSynchronized {
+			get { return list.IsSynchronized; }
+		}
+
+		object ICollection.SyncRoot {
+			get { return list.IsSynchronized; }
+		}
+		#endregion
+	}
+}