diff --git a/ExtendedWPFToolkitSolution/Src/Xceed.Wpf.AvalonDock/Controls/LayoutAnchorableTabItem.cs b/ExtendedWPFToolkitSolution/Src/Xceed.Wpf.AvalonDock/Controls/LayoutAnchorableTabItem.cs
index ee6695d7..856260cf 100644
--- a/ExtendedWPFToolkitSolution/Src/Xceed.Wpf.AvalonDock/Controls/LayoutAnchorableTabItem.cs
+++ b/ExtendedWPFToolkitSolution/Src/Xceed.Wpf.AvalonDock/Controls/LayoutAnchorableTabItem.cs
@@ -116,8 +116,11 @@ namespace Xceed.Wpf.AvalonDock.Controls
 
         #endregion
 
-        bool _isMouseDown = false;
-        static LayoutAnchorableTabItem _draggingItem = null;
+        private bool _isMouseDown = false;
+        private static LayoutAnchorableTabItem _draggingItem = null;
+        // There's an issue with panes resizing when selecting another tab, causing a
+        // mouse leave event to make the tab undock. This fixes that.
+        private static bool _cancelNextMouseLeave = false;
 
         internal static bool IsDraggingItem()
         {
@@ -132,6 +135,10 @@ namespace Xceed.Wpf.AvalonDock.Controls
         {
             _draggingItem = null;
         }
+        internal static void CancelNextMouseLeave()
+        {
+            _cancelNextMouseLeave = true;
+        }
 
         protected override void OnMouseLeftButtonDown(System.Windows.Input.MouseButtonEventArgs e)
         {
@@ -150,6 +157,11 @@ namespace Xceed.Wpf.AvalonDock.Controls
                 _isMouseDown = false;
                 _draggingItem = null;
             }
+            else
+            {
+                _cancelNextMouseLeave = false;
+            }
+
         }
 
         protected override void OnMouseLeftButtonUp(System.Windows.Input.MouseButtonEventArgs e)
@@ -167,10 +179,18 @@ namespace Xceed.Wpf.AvalonDock.Controls
 
             if (_isMouseDown && e.LeftButton == MouseButtonState.Pressed)
             {
-                _draggingItem = this;
+                if (!_cancelNextMouseLeave)
+                {
+                    _draggingItem = this;
+                }
+                else
+                {
+                    _draggingItem = null;
+                }
             }
 
             _isMouseDown = false;
+            _cancelNextMouseLeave = false;
         }
 
         protected override void OnMouseEnter(MouseEventArgs e)
diff --git a/ExtendedWPFToolkitSolution/Src/Xceed.Wpf.AvalonDock/Controls/LayoutGridControl.cs b/ExtendedWPFToolkitSolution/Src/Xceed.Wpf.AvalonDock/Controls/LayoutGridControl.cs
index 4e5303ca..c96e26dd 100644
--- a/ExtendedWPFToolkitSolution/Src/Xceed.Wpf.AvalonDock/Controls/LayoutGridControl.cs
+++ b/ExtendedWPFToolkitSolution/Src/Xceed.Wpf.AvalonDock/Controls/LayoutGridControl.cs
@@ -388,6 +388,10 @@ namespace Xceed.Wpf.AvalonDock.Controls
                 {
                     prevChildModel.DockWidth = new GridLength(prevChildModel.DockWidth.Value * (prevChildActualSize.Width + delta) / prevChildActualSize.Width, GridUnitType.Star);
                 }
+                else if (prevChildModel.DockWidth.IsAuto)
+                {
+                    prevChildModel.DockWidth = new GridLength(prevChildActualSize.Width + delta, GridUnitType.Pixel);
+                }
                 else
                 {
                     prevChildModel.DockWidth = new GridLength(prevChildModel.DockWidth.Value + delta, GridUnitType.Pixel);
@@ -397,6 +401,10 @@ namespace Xceed.Wpf.AvalonDock.Controls
                 {
                     nextChildModel.DockWidth = new GridLength(nextChildModel.DockWidth.Value * (nextChildActualSize.Width - delta) / nextChildActualSize.Width, GridUnitType.Star);
                 }
+                else if (nextChildModel.DockWidth.IsAuto)
+                {
+                    nextChildModel.DockWidth = new GridLength(nextChildActualSize.Width - delta, GridUnitType.Pixel);
+                }
                 else
                 {
                     nextChildModel.DockWidth = new GridLength(nextChildModel.DockWidth.Value - delta, GridUnitType.Pixel);
@@ -408,6 +416,10 @@ namespace Xceed.Wpf.AvalonDock.Controls
                 {
                     prevChildModel.DockHeight = new GridLength(prevChildModel.DockHeight.Value * (prevChildActualSize.Height + delta) / prevChildActualSize.Height, GridUnitType.Star);
                 }
+                else if (prevChildModel.DockHeight.IsAuto)
+                {
+                    prevChildModel.DockHeight = new GridLength(prevChildActualSize.Height + delta, GridUnitType.Pixel);
+                }
                 else
                 {
                     prevChildModel.DockHeight = new GridLength(prevChildModel.DockHeight.Value + delta, GridUnitType.Pixel);
@@ -417,6 +429,10 @@ namespace Xceed.Wpf.AvalonDock.Controls
                 {
                     nextChildModel.DockHeight = new GridLength(nextChildModel.DockHeight.Value * (nextChildActualSize.Height - delta) / nextChildActualSize.Height, GridUnitType.Star);
                 }
+                else if (nextChildModel.DockHeight.IsAuto)
+                {
+                    nextChildModel.DockHeight = new GridLength(nextChildActualSize.Height - delta, GridUnitType.Pixel);
+                }
                 else
                 {
                     nextChildModel.DockHeight = new GridLength(nextChildModel.DockHeight.Value - delta, GridUnitType.Pixel);
diff --git a/ExtendedWPFToolkitSolution/Src/Xceed.Wpf.AvalonDock/Layout/LayoutContent.cs b/ExtendedWPFToolkitSolution/Src/Xceed.Wpf.AvalonDock/Layout/LayoutContent.cs
index d7b3eaba..e0676604 100644
--- a/ExtendedWPFToolkitSolution/Src/Xceed.Wpf.AvalonDock/Layout/LayoutContent.cs
+++ b/ExtendedWPFToolkitSolution/Src/Xceed.Wpf.AvalonDock/Layout/LayoutContent.cs
@@ -84,25 +84,31 @@ namespace Xceed.Wpf.AvalonDock.Layout
 
         #region ContentId
 
-        private string _contentId = null;
+        //Added to make ContentId bindable
+        public static DependencyProperty ContentIdProperty =
+            DependencyProperty.Register(nameof(ContentId),
+              typeof(string), typeof(LayoutContent), new FrameworkPropertyMetadata(null, (s, e) =>
+               {
+                  (s as LayoutContent)?.RaisePropertyChanged(nameof(ContentId));
+              }));
+
         public string ContentId
         {
-            get 
+            get
             {
-                if (_contentId == null)
-                { 
+                if (GetValue(ContentIdProperty) == null)
+                {
                     var contentAsControl = _content as FrameworkElement;
                     if (contentAsControl != null && !string.IsNullOrWhiteSpace(contentAsControl.Name))
                         return contentAsControl.Name;
                 }
-                return _contentId; 
+                return (string)GetValue(ContentIdProperty);
             }
             set
             {
-                if (_contentId != value)
+                if (!String.Equals(GetValue(ContentIdProperty) as string, value))
                 {
-                    _contentId = value;
-                    RaisePropertyChanged("ContentId");
+                    SetValue(ContentIdProperty, value);
                 }
             }
         }
@@ -127,6 +133,7 @@ namespace Xceed.Wpf.AvalonDock.Layout
                         parentSelector.SelectedContentIndex = _isSelected ? parentSelector.IndexOf(this) : -1;
                     OnIsSelectedChanged(oldValue, value);
                     RaisePropertyChanged("IsSelected");
+                    Controls.LayoutAnchorableTabItem.CancelNextMouseLeave();
                 }
             }
         }
diff --git a/ExtendedWPFToolkitSolution/Src/Xceed.Wpf.Toolkit/MaskedTextBox/Implementation/MaskedTextBox.cs b/ExtendedWPFToolkitSolution/Src/Xceed.Wpf.Toolkit/MaskedTextBox/Implementation/MaskedTextBox.cs
index 4d68eedb..43e9d9d7 100644
--- a/ExtendedWPFToolkitSolution/Src/Xceed.Wpf.Toolkit/MaskedTextBox/Implementation/MaskedTextBox.cs
+++ b/ExtendedWPFToolkitSolution/Src/Xceed.Wpf.Toolkit/MaskedTextBox/Implementation/MaskedTextBox.cs
@@ -1441,7 +1441,7 @@ namespace Xceed.Wpf.Toolkit
 
     internal override bool GetIsEditTextEmpty()
     {
-      return ( this.MaskedTextProvider.AssignedEditPositionCount == 0 );
+      return MaskedTextProvider != null && (MaskedTextProvider.AssignedEditPositionCount == 0 );
     }
 
     #endregion INTERNAL PROPERTIES
diff --git a/ExtendedWPFToolkitSolution/Src/Xceed.Wpf.Toolkit/RichTextBoxFormatBar/RichTextBoxFormatBarManager.cs b/ExtendedWPFToolkitSolution/Src/Xceed.Wpf.Toolkit/RichTextBoxFormatBar/RichTextBoxFormatBarManager.cs
index 5b8a9752..53a6c0f0 100644
--- a/ExtendedWPFToolkitSolution/Src/Xceed.Wpf.Toolkit/RichTextBoxFormatBar/RichTextBoxFormatBarManager.cs
+++ b/ExtendedWPFToolkitSolution/Src/Xceed.Wpf.Toolkit/RichTextBoxFormatBar/RichTextBoxFormatBarManager.cs
@@ -210,13 +210,25 @@ namespace Xceed.Wpf.Toolkit
       //top
       if( top < 0 )
       {
-        top = mousePosition.Y + 10;
+       top = Math.Max( mousePosition.Y + 10, 5 );
+      }
+      
+      // bottom 
+      if ( top + adorningEditor.ActualHeight > _richTextBox.ActualHeight - 20 )
+      {
+       top = _richTextBox.ActualHeight - adorningEditor.ActualHeight - 20;
+      }
+
+      // left boundary 
+      if ( left < 0 )
+      {
+       left = 5;
       }
 
       //right boundary
       if( left + adorningEditor.ActualWidth > _richTextBox.ActualWidth - 20 )
       {
-        left = left - ( adorningEditor.ActualWidth - ( _richTextBox.ActualWidth - left ) );
+       left = _richTextBox.ActualWidth - adorningEditor.ActualWidth - 20;
       }
 
       _adorner.SetOffsets( left, top );