add missing files

apps/tests/pages/page19.ts

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+import observable = require("data/observable");
+import trace = require("trace");
+trace.addCategories(trace.categories.Layout);
+trace.enable();
+
+export function onLoaded(args: observable.EventData) {
+    (<any>args.object).bindingContext = [0, 1];
+}

apps/tests/pages/page19.xml

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+<Page loaded="onLoaded">
+  <ListView items="{{ $value }}" verticalAlignment="top" />
+</Page>

apps/tests/pages/page20.ts

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+import observable = require("data/observable");
+import trace = require("trace");
+import {Button} from "ui/button";
+import {Page} from "ui/page";
+trace.addCategories(trace.categories.Layout);
+trace.enable();
+
+export function onTap(args: observable.EventData) {
+    var btn = <Button>args.object;
+    (<Page>btn.page).showModal("tests/pages/page21", null, null);
+}

apps/tests/pages/page20.xml

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+<Page id="page" loaded="onLoaded">
+  <StackLayout>
+    <Button tap="onTap" text="Show Modal Page"/>
+  </StackLayout>
+</Page>

apps/tests/ui/page/page21.ts

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+import {ShownModallyData} from "ui/page";
+
+export function onShownModally(args: ShownModallyData) {
+    args.context.childPage = args.object;
+    args.context.close = args.closeCallback;
+
+    setTimeout(() => {
+        (<any>args.object).bindingContext = [0, 1];
+    }, 200);
+}

apps/tests/ui/page/page21.xml

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+<Page shownModally="onShownModally">
+  <StackLayout>
+    <Label text="In Modal Page" />
+    <Repeater items="{{ $value }}" verticalAlignment="top" />
+  </StackLayout>
+</Page>