added in code comments

source/Components/AvalonDock/Controls/AnchorablePaneTitle.cs

@@ -15,14 +15,21 @@ This program is provided to you under the terms of the Microsoft Public
 
 namespace AvalonDock.Controls
 {
+	/// <summary>
+	/// This control defines the Title area of a <see cref="LayoutAnchorableControl"/>.
+	/// It is used to show a title bar with docking window buttons to let users interact
+	/// with a <see cref="LayoutAnchorable"/> via drop down menu click or drag & drop.
+	/// </summary>
 	public class AnchorablePaneTitle : Control
 	{
 		#region fields
 		private bool _isMouseDown = false;
 		#endregion fields
 
 		#region Constructors
-
+		/// <summary>
+		/// Static class constructor
+		/// </summary>
 		static AnchorablePaneTitle()
 		{
 			IsHitTestVisibleProperty.OverrideMetadata(typeof(AnchorablePaneTitle), new FrameworkPropertyMetadata(true));

source/Components/AvalonDock/Controls/LayoutDocumentControl.cs

@@ -22,7 +22,9 @@ namespace AvalonDock.Controls
 	public class LayoutDocumentControl : Control
 	{
 		#region Constructors
-
+		/// <summary>
+		/// Static class constructor
+		/// </summary>
 		static LayoutDocumentControl()
 		{
 			DefaultStyleKeyProperty.OverrideMetadata(typeof(LayoutDocumentControl), new FrameworkPropertyMetadata(typeof(LayoutDocumentControl)));

source/Components/AvalonDock/Controls/LayoutDocumentFloatingWindowControl.cs

@@ -32,12 +32,17 @@ public class LayoutDocumentFloatingWindowControl : LayoutFloatingWindowControl,
 		#endregion fields
 
 		#region Constructors
-
+		/// <summary>Static class constructor</summary>
 		static LayoutDocumentFloatingWindowControl()
 		{
 			DefaultStyleKeyProperty.OverrideMetadata(typeof(LayoutDocumentFloatingWindowControl), new FrameworkPropertyMetadata(typeof(LayoutDocumentFloatingWindowControl)));
 		}
 
+		/// <summary>
+		/// Class constructor
+		/// </summary>
+		/// <param name="model"></param>
+		/// <param name="isContentImmutable"></param>
 		internal LayoutDocumentFloatingWindowControl(LayoutDocumentFloatingWindow model, bool isContentImmutable)
 			: base(model, isContentImmutable)
 		{
@@ -48,6 +53,10 @@ internal LayoutDocumentFloatingWindowControl(LayoutDocumentFloatingWindow model,
 			UpdateThemeResources();
 		}
 
+		/// <summary>
+		/// Class constructor
+		/// </summary>
+		/// <param name="model"></param>
 		internal LayoutDocumentFloatingWindowControl(LayoutDocumentFloatingWindow model)
 			: this(model, false)
 		{

source/Components/AvalonDock/Layout/ILayoutContentSelector.cs

@@ -9,6 +9,7 @@ This program is provided to you under the terms of the Microsoft Public
 
 namespace AvalonDock.Layout
 {
+	/// <summary>Defines an API for interacting with (selected) content in a pane.</summary>
 	public interface ILayoutContentSelector
 	{
 		#region Properties

source/Components/AvalonDock/Layout/LayoutAnchorGroup.cs

@@ -13,6 +13,9 @@ This program is provided to you under the terms of the Microsoft Public
 
 namespace AvalonDock.Layout
 {
+	/// <summary>
+	/// Implements the layout model for the <see cref="Controls.LayoutAnchorGroupControl"/>.
+	/// </summary>
 	[ContentProperty(nameof(Children))]
 	[Serializable]
 	public class LayoutAnchorGroup : LayoutGroup<LayoutAnchorable>, ILayoutPreviousContainer, ILayoutPaneSerializable

source/Components/AvalonDock/Layout/LayoutContent.cs

@@ -19,12 +19,18 @@ This program is provided to you under the terms of the Microsoft Public
 
 namespace AvalonDock.Layout
 {
+	/// <summary>
+	/// Provides an abstract base class for common properties and methods of
+	/// the <see cref="LayoutAnchorable"/> and <see cref="LayoutDocument"/> classes.
+	/// </summary>
 	[ContentProperty(nameof(Content))]
 	[Serializable]
 	public abstract class LayoutContent : LayoutElement, IXmlSerializable, ILayoutElementForFloatingWindow, IComparable<LayoutContent>, ILayoutPreviousContainer
 	{
 		#region Constructors
-
+		/// <summary>
+		/// Class constructor
+		/// </summary>
 		internal LayoutContent()
 		{
 		}

source/Components/AvalonDock/Layout/LayoutDocument.cs

@@ -12,6 +12,9 @@ This program is provided to you under the terms of the Microsoft Public
 
 namespace AvalonDock.Layout
 {
+	/// <summary>
+	/// Implements the layout model for the <see cref="Controls.LayoutDocumentControl"/>.
+	/// </summary>
 	[Serializable]
 	public class LayoutDocument : LayoutContent
 	{

source/Components/AvalonDock/Layout/LayoutDocumentFloatingWindow.cs

@@ -17,6 +17,7 @@ This program is provided to you under the terms of the Microsoft Public
 
 namespace AvalonDock.Layout
 {
+	/// <summary>Implements the layout model for the <see cref="Controls.LayoutDocumentFloatingWindowControl"/>.</summary>
 	[ContentProperty(nameof(RootPanel))]
 	[Serializable]
 	public class LayoutDocumentFloatingWindow : LayoutFloatingWindow, ILayoutElementWithVisibility

source/Components/AvalonDock/Layout/LayoutPanel.cs

@@ -14,6 +14,7 @@ This program is provided to you under the terms of the Microsoft Public
 
 namespace AvalonDock.Layout
 {
+	/// <summary>Implements the layout model for the <see cref="Controls.LayoutPanelControl"/>.</summary>
 	[ContentProperty(nameof(Children))]
 	[Serializable]
 	public class LayoutPanel : LayoutPositionableGroup<ILayoutPanelElement>, ILayoutPanelElement, ILayoutOrientableGroup
@@ -23,11 +24,13 @@ public class LayoutPanel : LayoutPositionableGroup<ILayoutPanelElement>, ILayout
 		#endregion fields
 
 		#region Constructors
-
+		/// <summary>Class constructor</summary>
 		public LayoutPanel()
 		{
 		}
 
+		/// <summary>Class constructor</summary>
+		/// <param name="firstChild"></param>
 		public LayoutPanel(ILayoutPanelElement firstChild)
 		{
 			Children.Add(firstChild);
@@ -36,7 +39,7 @@ public LayoutPanel(ILayoutPanelElement firstChild)
 		#endregion Constructors
 
 		#region Properties
-
+		/// <summary>Gets/sets the orientation for this panel.</summary>
 		public Orientation Orientation
 		{
 			get => _orientation;
@@ -63,6 +66,7 @@ public override void WriteXml(System.Xml.XmlWriter writer)
 			base.WriteXml(writer);
 		}
 
+		/// <inheritdoc />
 		public override void ReadXml(System.Xml.XmlReader reader)
 		{
 			if (reader.MoveToAttribute(nameof(Orientation)))
@@ -71,6 +75,7 @@ public override void ReadXml(System.Xml.XmlReader reader)
 		}
 
 #if TRACE
+		/// <inheritdoc />
 		public override void ConsoleDump(int tab)
 		{
 			System.Diagnostics.Trace.Write(new string(' ', tab * 4));

source/Components/AvalonDock/Layout/LayoutPositionableGroup.cs

@@ -16,6 +16,8 @@ This program is provided to you under the terms of the Microsoft Public
 
 namespace AvalonDock.Layout
 {
+	/// <summary>Provides a base class for other layout panel models that support a specific class of panel.</summary>
+	/// <typeparam name="T"></typeparam>
 	[Serializable]
 	public abstract class LayoutPositionableGroup<T> : LayoutGroup<T>, ILayoutPositionableElementWithActualSize where T : class, ILayoutElement
 	{