Fix - nav button with reflection

apps/action-bar-demo/pages/page-title-icon.ts

@@ -18,3 +18,21 @@ export function buttonTap(args: observable.EventData) {
     }
 }
 
+
+var j = 0;
+export function visibilityTap(args: observable.EventData) {
+    var page = <pages.Page>view.getAncestor(<view.View>args.object, "Page")
+
+    if (j % 3 === 0) {
+        page.actionBar.androidIconVisibility = "always";
+    }
+    else if (j % 3 === 1) {
+        page.actionBar.androidIconVisibility = "never";
+    }
+    else if (j % 3 === 2) {
+        page.actionBar.androidIconVisibility = "auto";
+    }
+    j++;
+    console.log("Visibility changed to: " + page.actionBar.androidIconVisibility);
+}
+

apps/action-bar-demo/pages/page-title-icon.xml

@@ -4,5 +4,6 @@
   </Page.actionBar>
   <StackLayout>
     <Button text="button" tap="buttonTap"/>
+    <Button text="change main icon visibility" tap="visibilityTap"/>
   </StackLayout>
 </Page>