TabStrip now selects on click.

Perspex/Controls/TabItem.cs

@@ -8,8 +8,19 @@ namespace Perspex.Controls
 {
     public class TabItem : HeaderedContentControl
     {
+        public static readonly PerspexProperty<bool> IsSelectedProperty =
+            PerspexProperty.Register<TabItem, bool>("IsSelected");
+
         public TabItem()
         {
+            this.AddPseudoClass(IsSelectedProperty, ":selected");
+            AffectsRender(IsSelectedProperty);
+        }
+
+        public bool IsSelected
+        {
+            get { return this.GetValue(IsSelectedProperty); }
+            set { this.SetValue(IsSelectedProperty, value); }
         }
     }
 }

Perspex/Controls/TabStrip.cs

@@ -4,12 +4,10 @@
 // </copyright>
 // -----------------------------------------------------------------------
 
+using Perspex.Input;
+
 namespace Perspex.Controls
 {
-    using System;
-    using System.Collections.Generic;
-    using System.Linq;
-
     public class TabStrip : ItemsControl
     {
         private static readonly ItemsPanelTemplate PanelTemplate = new ItemsPanelTemplate(
@@ -23,5 +21,31 @@ namespace Perspex.Controls
             ItemsPanelProperty.OverrideDefaultValue(typeof(TabStrip), PanelTemplate);
             ItemTemplateProperty.OverrideDefaultValue(typeof(TabStrip), TabTemplate);
         }
+
+        public TabStrip()
+        {
+            this.PointerPressed += this.OnPointerPressed;
+        }
+
+        private void OnPointerPressed(object sender, PointerEventArgs e)
+        {
+            IVisual source = (IVisual)e.Source;
+            ContentPresenter presenter = source.GetVisualAncestor<ContentPresenter>();
+
+            if (presenter !=  null)
+            {
+                TabItem item = presenter.TemplatedParent as TabItem;
+
+                if (item != null && item.TemplatedParent == this)
+                {
+                    item.IsSelected = true;
+
+                    foreach (var i in item.GetVisualSiblings<TabItem>())
+                    {
+                        i.IsSelected = false;
+                    }
+                }
+            }
+        }
     }
 }

Perspex/VisualExtensions.cs

@@ -124,5 +124,21 @@ namespace Perspex
                 }
             }
         }
+
+        public static IEnumerable<T> GetVisualSiblings<T>(this IVisual visual)
+        {
+            IVisual parent = visual.VisualParent;
+
+            if (parent != null)
+            {
+                foreach (T sibling in parent.VisualChildren.OfType<T>())
+                {
+                    if ((IVisual)sibling != visual)
+                    {
+                        yield return sibling;
+                    }
+                }
+            }
+        }
     }
 }

TestApplication/Program.cs

@@ -77,6 +77,7 @@ namespace TestApplication
                                 new TabItem
                                 {
                                     Header = "Tab 1",
+                                    IsSelected = true,
                                 },
                                 new TabItem
                                 {