diff --git a/DarkUI/DarkUI.csproj b/DarkUI/DarkUI.csproj
index 93d3e2a..c2855f9 100644
--- a/DarkUI/DarkUI.csproj
+++ b/DarkUI/DarkUI.csproj
@@ -107,6 +107,7 @@
       <SubType>UserControl</SubType>
     </Compile>
     <Compile Include="Docking\Items\DarkDockSplitter.cs" />
+    <Compile Include="Docking\Items\DarkDockTab.cs" />
     <Compile Include="Extensions\BitmapExtensions.cs" />
     <Compile Include="Extensions\IEnumerableExtensions.cs" />
     <Compile Include="Forms\DarkDialog.cs">
diff --git a/DarkUI/Docking/DarkDockGroup.cs b/DarkUI/Docking/DarkDockGroup.cs
index b386945..c5a9dcb 100644
--- a/DarkUI/Docking/DarkDockGroup.cs
+++ b/DarkUI/Docking/DarkDockGroup.cs
@@ -1,7 +1,6 @@
 using DarkUI.Config;
 using System.Collections.Generic;
 using System.ComponentModel;
-using System.Drawing;
 using System.Windows.Forms;
 
 namespace DarkUI.Docking
@@ -23,25 +22,25 @@ namespace DarkUI.Docking
 
         public DarkDockArea DockArea { get; private set; }
 
-        public int ContentCount
-        {
-            get
-            {
-                return _contents.Count;
-            }
-        }
+        public DarkDockContent VisibleContent { get; private set; }
+
+        public int Order { get; set; }
+
+        public int ContentCount { get { return _contents.Count; } }
 
         #endregion
 
         #region Constructor Region
 
-        public DarkDockGroup(DarkDockPanel dockPanel, DarkDockRegion dockRegion)
+        public DarkDockGroup(DarkDockPanel dockPanel, DarkDockRegion dockRegion, int order)
         {
             _contents = new List<DarkDockContent>();
 
             DockPanel = dockPanel;
             DockRegion = dockRegion;
             DockArea = dockRegion.DockArea;
+
+            Order = order;
         }
 
         #endregion
@@ -55,6 +54,9 @@ namespace DarkUI.Docking
 
             _contents.Add(dockContent);
             Controls.Add(dockContent);
+
+            if (VisibleContent == null)
+                VisibleContent = dockContent;
         }
 
         public void RemoveContent(DarkDockContent dockContent)
@@ -63,6 +65,15 @@ namespace DarkUI.Docking
 
             _contents.Remove(dockContent);
             Controls.Remove(dockContent);
+
+            if (VisibleContent == dockContent)
+            {
+                VisibleContent = null;
+
+                // todo: order?
+                foreach (var content in _contents)
+                    VisibleContent = content;
+            }
         }
 
         #endregion
diff --git a/DarkUI/Docking/DarkDockRegion.cs b/DarkUI/Docking/DarkDockRegion.cs
index e79c2ae..c1e38ad 100644
--- a/DarkUI/Docking/DarkDockRegion.cs
+++ b/DarkUI/Docking/DarkDockRegion.cs
@@ -4,6 +4,7 @@ using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Drawing;
+using System.Linq;
 using System.Windows.Forms;
 
 namespace DarkUI.Docking
@@ -68,6 +69,8 @@ namespace DarkUI.Docking
             // Show the region if it was previously hidden
             if (!Visible)
                 Visible = true;
+
+            PositionGroups();
         }
 
         public void RemoveContent(DarkDockContent dockContent)
@@ -84,25 +87,43 @@ namespace DarkUI.Docking
             // If we just removed the final group, and this isn't the document region, then hide
             if (_groups.Count == 0 && DockArea != DarkDockArea.Document)
                 Visible = false;
+
+            PositionGroups();
         }
 
         private DarkDockGroup CreateGroup()
         {
-            var newGroup = new DarkDockGroup(DockPanel, this);
+            var order = 0;
+
+            if (_groups.Count >= 1)
+            {
+                order = -1;
+                foreach (var group in _groups)
+                {
+                    if (group.Order >= order)
+                        order = group.Order + 1;
+                }
+            }
+
+            var newGroup = new DarkDockGroup(DockPanel, this, order);
             _groups.Add(newGroup);
             Controls.Add(newGroup);
 
-            PositionGroups();
-
             return newGroup;
         }
 
         private void RemoveGroup(DarkDockGroup group)
         {
+            var lastOrder = group.Order;
+
             _groups.Remove(group);
             Controls.Remove(group);
 
-            PositionGroups();
+            foreach (var otherGroup in _groups)
+            {
+                if (otherGroup.Order > lastOrder)
+                    otherGroup.Order--;
+            }
         }
 
         private void PositionGroups()
@@ -127,21 +148,52 @@ namespace DarkUI.Docking
             if (_groups.Count == 1)
             {
                 _groups[0].Dock = DockStyle.Fill;
+                return;
             }
-            else if (_groups.Count > 1)
+
+            if (_groups.Count > 1)
             {
-                foreach (var group in _groups)
+                var lastGroup = _groups.OrderByDescending(g => g.Order).First();
+
+                foreach (var group in _groups.OrderByDescending(g => g.Order))
                 {
                     group.SendToBack();
 
-                    if (_groups.IsFirst(group))
+                    if (group.Order == lastGroup.Order)
                         group.Dock = DockStyle.Fill;
                     else
                         group.Dock = dockStyle;
                 }
+
+                SizeGroups();
             }
         }
 
+        private void SizeGroups()
+        {
+            if (_groups.Count <= 1)
+                return;
+
+            var size = new Size(0, 0);
+
+            switch (DockArea)
+            {
+                default:
+                case DarkDockArea.Document:
+                    return;
+                case DarkDockArea.Left:
+                case DarkDockArea.Right:
+                    size = new Size(Width, Height / _groups.Count);
+                    break;
+                case DarkDockArea.Bottom:
+                    size = new Size(Width / _groups.Count, Height);
+                    break;
+            }
+
+            foreach (var group in _groups)
+                group.Size = size;
+        }
+
         private void BuildProperties()
         {
             MinimumSize = new Size(50, 50);
@@ -205,6 +257,8 @@ namespace DarkUI.Docking
 
         private void ParentForm_ResizeEnd(object sender, EventArgs e)
         {
+            SizeGroups();
+
             if (_splitter != null)
                 _splitter.UpdateBounds();
         }
@@ -213,6 +267,8 @@ namespace DarkUI.Docking
         {
             base.OnLayout(e);
 
+            SizeGroups();
+
             if (_splitter != null)
                 _splitter.UpdateBounds();
         }
diff --git a/DarkUI/Docking/Items/DarkDockTab.cs b/DarkUI/Docking/Items/DarkDockTab.cs
new file mode 100644
index 0000000..8e17979
--- /dev/null
+++ b/DarkUI/Docking/Items/DarkDockTab.cs
@@ -0,0 +1,46 @@
+using System.Drawing;
+
+namespace DarkUI.Docking
+{
+    internal class DarkDockTab
+    {
+        #region Property Region
+
+        public DarkDockContent DockContent { get; set; }
+
+        public Rectangle ClientRectangle { get; set; }
+
+        public Rectangle CloseButtonRectangle { get; set; }
+
+        public bool Hot { get; set; }
+
+        public bool Pressed { get; set; }
+
+        public bool CloseButtonHot { get; set; }
+
+        public bool ShowSeparator { get; set; }
+
+        #endregion
+
+        #region Constructor Region
+
+        public DarkDockTab(DarkDockContent content)
+        {
+            DockContent = content;
+        }
+
+        #endregion
+
+        #region Method Region
+
+        public int CalculateWidth(Graphics g, Font font)
+        {
+            var width = (int)g.MeasureString(DockContent.DockText, font).Width;
+            width += 10;
+
+            return width;
+        }
+
+        #endregion
+    }
+}
diff --git a/Example/Forms/Docking/DockHistory.Designer.cs b/Example/Forms/Docking/DockHistory.Designer.cs
index 84d5a8f..461f574 100644
--- a/Example/Forms/Docking/DockHistory.Designer.cs
+++ b/Example/Forms/Docking/DockHistory.Designer.cs
@@ -31,7 +31,7 @@ namespace Example
         /// </summary>
         private void InitializeComponent()
         {
-            this.lstHistory = new DarkListView();
+            this.lstHistory = new DarkUI.Controls.DarkListView();
             this.SuspendLayout();
             // 
             // lstHistory
@@ -48,7 +48,7 @@ namespace Example
             this.AutoScaleDimensions = new System.Drawing.SizeF(7F, 15F);
             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
             this.Controls.Add(this.lstHistory);
-            this.DockArea = DarkDockArea.Bottom;
+            this.DockArea = DarkUI.Config.DarkDockArea.Right;
             this.DockText = "History";
             this.Font = new System.Drawing.Font("Segoe UI", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
             this.Icon = global::Example.Icons.RefactoringLog_12810;