Made TabViewItem bindable.

apps/tests/app/pageNavigation.ts

@@ -15,10 +15,10 @@ export function createPage() {
             topFrame.goBack();
         });
 
-        tab.items.push({
+        tab.items.push(new tabViewModule.TabViewItem({
             title: "Tab " + i,
             view: button
-        });
+        }));
     }
     var page = new pages.Page();
     page.content = tab;

apps/tests/ui/style/style-tests.ts

@@ -47,10 +47,7 @@ export function test_css_is_applied_inside_TabView() {
     var testButton = new buttonModule.Button();
     testButton.text = "Test";
     var tabView = new tabViewModule.TabView();
-    tabView.items = [{
-        title: "First tab",
-        view: testButton
-    }];
+    tabView.items = [new tabViewModule.TabViewItem({ title: "First tab", view: testButton })];
 
     helper.buildUIAndRunTest(tabView, function (views: Array<viewModule.View>) {
         var page = <pageModule.Page>views[1];

apps/tests/ui/tab-view/tab-view-tests.ts

@@ -57,10 +57,10 @@ function _createItems(count: number): Array<tabViewModule.TabViewItem> {
     for (var i = 0; i < count; i++) {
         var label = new labelModule.Label();
         label.text = "Tab " + i;
-        var tabEntry = {
+        var tabEntry = new tabViewModule.TabViewItem({
             title: "Tab " + i,
             view: label
-        };
+        });
         items.push(tabEntry);
     }
     return items;
@@ -267,7 +267,7 @@ export var testBindingToTabEntryWithUndefinedViewShouldThrow = function () {
     helper.buildUIAndRunTest(tabView, function (views: Array<viewModule.View>) {
         var tabView = <tabViewModule.TabView>views[0];
         TKUnit.assertThrows(function () {
-            tabView.items = [{ title: "Tab 0", view: undefined }];
+            tabView.items = [new tabViewModule.TabViewItem({ title: "Tab 0", view: undefined })];
         }, "Binding TabView to a TabViewItem with undefined view should throw.");
     });
 }
@@ -277,7 +277,7 @@ export var testBindingToTabEntryWithNullViewShouldThrow = function () {
     helper.buildUIAndRunTest(tabView, function (views: Array<viewModule.View>) {
         var tabView = <tabViewModule.TabView>views[0];
         TKUnit.assertThrows(function () {
-            tabView.items = [{ title: "Tab 0", view: null }];
+            tabView.items = [new tabViewModule.TabViewItem({ title: "Tab 0", view: null })];
         }, "Binding TabView to a TabViewItem with null view should throw.");
     });
 }
@@ -462,10 +462,10 @@ export function testBindingIsRefreshedWhenTabViewItemIsUnselectedAndThenSelected
         label0.id = "testLabel";
         label0.bind({ sourceProperty: "counter", targetProperty: "text", twoWay: true });
         StackLayout0.addChild(label0);
-        var tabEntry0 = {
+        var tabEntry0 = new tabViewModule.TabViewItem({
             title: "Tab 0",
             view: StackLayout0
-        };
+        });
         items.push(tabEntry0);
         tabView.items = items;
 

declarations.d.ts

@@ -1,4 +1,6 @@
 /* tslint:disable:no-unused-variable */
+/// <reference path="C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\IDE\CommonExtensions\Microsoft\TypeScript\lib.d.ts"/> 
+
 declare class Request {
     constructor(input: string|Request, init?: RequestInit);
     method: string;

ui/core/bindable.ts

@@ -35,7 +35,14 @@ export class Bindable extends dependencyObservable.DependencyObservable implemen
     public static bindingContextProperty = bindingContextProperty;
 
     // TODO: Implement with WeakRef to prevent memory leaks.
-    private _bindings = {};
+    private _bindings: Object;
+
+    private get bindings(): Object {
+        if (!this._bindings) {
+            this._bindings = {};
+        }
+        return this._bindings;
+    }
 
     get bindingContext(): Object {
         return this._getValue(Bindable.bindingContextProperty);
@@ -45,13 +52,13 @@ export class Bindable extends dependencyObservable.DependencyObservable implemen
     }
 
     public bind(options: definition.BindingOptions, source?: Object) {
-        var binding: Binding = this._bindings[options.targetProperty];
+        var binding: Binding = this.bindings[options.targetProperty];
         if (binding) {
             binding.unbind();
         }
 
         binding = new Binding(this, options);
-        this._bindings[options.targetProperty] = binding;
+        this.bindings[options.targetProperty] = binding;
 
         var bindingSource = source;
         if (!bindingSource) {
@@ -64,15 +71,15 @@ export class Bindable extends dependencyObservable.DependencyObservable implemen
     }
 
     public unbind(property: string) {
-        var binding: Binding = this._bindings[property];
+        var binding: Binding = this.bindings[property];
         if (binding) {
             binding.unbind();
-            delete this._bindings[property];
+            delete this.bindings[property];
         }
     }
 
     public _updateTwoWayBinding(propertyName: string, value: any) {
-        var binding: Binding = this._bindings[propertyName];
+        var binding: Binding = this.bindings[propertyName];
 
         if (binding) {
             binding.updateTwoWay(value);
@@ -92,7 +99,7 @@ export class Bindable extends dependencyObservable.DependencyObservable implemen
                 return;
             }
         }
-        var binding = this._bindings[property.name];
+        var binding = this.bindings[property.name];
         if (binding && !binding.updating) {
             if (binding.options.twoWay) {
                 trace.write("_updateTwoWayBinding(" + this + "): " + property.name, trace.categories.Binding);
@@ -107,8 +114,8 @@ export class Bindable extends dependencyObservable.DependencyObservable implemen
 
     public _onBindingContextChanged(oldValue: any, newValue: any) {
         var binding: Binding;
-        for (var p in this._bindings) {
-            binding = this._bindings[p];
+        for (var p in this.bindings) {
+            binding = this.bindings[p];
 
             if (binding.updating || !binding.sourceIsBindingContext) {
                 continue;

ui/tab-view/tab-view-common.ts

@@ -1,12 +1,53 @@
 import definition = require("ui/tab-view");
 import view = require("ui/core/view");
+import observable = require("data/observable");
 import dependencyObservable = require("ui/core/dependency-observable");
 import proxy = require("ui/core/proxy");
 import types = require("utils/types");
 import trace = require("trace");
+import bindable = require("ui/core/bindable");
 
 export var traceCategory = "TabView";
 
+export class TabViewItem extends bindable.Bindable implements definition.TabViewItem {
+    private _title: string;
+    private _view: view.View;
+    private _iconSource: string;
+
+    get title(): string {
+        return this._title;
+    }
+
+    set title(value: string) {
+        if (this._title !== value) {
+            this._title = value;
+            console.log(`set this._title = ${value};`)
+        }
+    }
+
+    get view(): view.View {
+        return this._view;
+    }
+
+    set view(value: view.View) {
+        if (this._view !== value) {
+            this._view = value;
+            console.log(`set this._view = ${value};`)
+        }
+    }
+
+    get iconSource(): string {
+        return this._iconSource;
+    }
+
+    set iconSource(value: string) {
+        if (this._iconSource !== value) {
+            this._iconSource = value;
+            console.log(`set this._iconSource = ${value};`)
+        }
+    }
+}
+
 var TAB_VIEW = "TabView";
 var ITEMS = "items";
 var SELECTED_INDEX = "selectedIndex";
@@ -176,4 +217,15 @@ export class TabView extends view.View implements definition.TabView, view.AddAr
             }
         }
     }
+
+    public _onBindingContextChanged(oldValue: any, newValue: any) {
+        super._onBindingContextChanged(oldValue, newValue);
+        if (this.items && this.items.length > 0) {
+            var i = 0;
+            var length = this.items.length;
+            for (; i < length; i++) {
+                this.items[i].bindingContext = newValue;
+            }    
+        }
+    }
 } 

ui/tab-view/tab-view.d.ts

@@ -5,25 +5,26 @@ declare module "ui/tab-view" {
     import view = require("ui/core/view");
     import dependencyObservable = require("ui/core/dependency-observable");
     import observable = require("data/observable");
+    import bindable = require("ui/core/bindable");
 
     /**
      * Represents a tab view entry.
      */
-    interface TabViewItem {
+    class TabViewItem extends bindable.Bindable {
         /**
          * Gets or sets the title of the TabViewItem.
          */
-        title: string;
+        public title: string;
 
         /**
          * Gets or sets the view of the TabViewItem.
          */
-        view: view.View;
+        public view: view.View;
         
         /**
          * Gets or sets the icon source of the TabViewItem. This could either be a a file name or resource id.
          */
-        iconSource?: string;
+        public iconSource: string;
     }
 
     /**