diff --git a/.DS_Store b/.DS_Store
index 0b2aa60..d2a7294 100644
Binary files a/.DS_Store and b/.DS_Store differ
diff --git a/.gitignore b/.gitignore
index c4735fd..0d8c1e4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,9 +5,9 @@
 demo/app/*.js
 !demo/karma.conf.js
 !demo/app/tests/*.js
-demo/*.d.ts
 !demo/references.d.ts
 demo/lib
 demo/platforms
 demo/node_modules
+demo/hooks
 node_modules
\ No newline at end of file
diff --git a/demo/app/app.ts b/demo/app/app.ts
new file mode 100644
index 0000000..98f8260
--- /dev/null
+++ b/demo/app/app.ts
@@ -0,0 +1,2 @@
+import * as application from 'application';
+application.start({ moduleName: "main-page" });
diff --git a/demo/app/main-page.ts b/demo/app/main-page.ts
new file mode 100644
index 0000000..9f76b86
--- /dev/null
+++ b/demo/app/main-page.ts
@@ -0,0 +1,16 @@
+import * as observable from 'data/observable';
+import * as pages from 'ui/page';
+import {HelloWorldModel} from './main-view-model';
+import { EventData } from 'data/observable';
+import { Page } from 'ui/page';
+import { isAndroid, device } from "platform";
+import { Color } from "color";
+import { android } from "application";
+// Event handler for Page 'loaded' event attached in main-page.xml
+export function pageLoaded(args: observable.EventData) {
+    // Get the event sender
+    let page = <pages.Page>args.object;
+    page.bindingContext = new HelloWorldModel(page);
+
+}
+ 
\ No newline at end of file
diff --git a/demo/app/main-view-model.ts b/demo/app/main-view-model.ts
new file mode 100644
index 0000000..8fa23ca
--- /dev/null
+++ b/demo/app/main-view-model.ts
@@ -0,0 +1,21 @@
+import {Observable} from 'data/observable';
+import {AndroidIosSwitch} from 'nativescript-android-iosswitch';
+import { Page } from 'ui/page';
+export class HelloWorldModel extends Observable {
+
+  public message: string;
+  private npb: AndroidIosSwitch;
+  constructor(mainPage: Page) {
+    super();
+    // this.npb = new NumberProgressBar();
+    this.npb = <AndroidIosSwitch>mainPage.getViewById('sb');
+
+  }
+     public onTrue() {
+        this.npb.toggleSwitch(true);
+    }
+  public onFalse() {
+        this.npb.setChecked(false);
+    }
+}
+