Initial WPF content migrated (#17)

* Reset branch for WPF changes

* Convert BMP to PNG; fix link-out-of-scope err

* Add snippets for WPF... 6794 files!!!!

* Add missing snippets

* update file updated between migration

* Fix paths to include

* update breadcrumb and toc

* fix index links

* fix index links

* fix index links

* fix markdown

dotnet-desktop-guide/framework/wpf/advanced/index.md

@@ -0,0 +1,36 @@
+---
+title: "Advanced (Windows Presentation Foundation)"
+description: Learn about advanced topics in Windows Presentation Foundation, such as architecture, base element classes, and the property system.
+ms.date: "03/30/2017"
+f1_keywords: 
+  - "AutoGeneratedOrientationPage"
+helpviewer_keywords: 
+  - "content models [WPF]"
+  - "WPF content model [WPF]"
+  - "WPF programming model [WPF]"
+  - "XAML [WPF], content models"
+ms.assetid: 58843391-b28c-4d32-adf5-87acaf6578a1
+---
+# Advanced (Windows Presentation Foundation)
+
+This section describes some of the advanced areas in WPF.
+
+## In This Section
+
+[WPF Architecture](wpf-architecture.md)\
+[XAML in WPF](xaml-in-wpf.md)\
+[Base Element Classes](base-elements.md)\
+[Element Tree and Serialization](element-tree-and-serialization.md)\
+[WPF Property System](properties-wpf.md)\
+[Events in WPF](events-wpf.md)\
+[Input](input-wpf.md)\
+[Drag and Drop](drag-and-drop.md)\
+[Resources](resources-wpf.md)\
+[Documents](documents.md)\
+[Globalization and Localization](globalization-and-localization.md)\
+[Layout](layout.md)\
+[Types migrated from WPF to System.Xaml](types-migrated-from-wpf-to-system.md)\
+[Migration and Interoperability](migration-and-interoperability.md)\
+[Performance](performance.md)\
+[Threading Model](threading-model.md)\
+[Unmanaged WPF API Reference](wpf-unmanaged-api-reference.md)\