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/controls/popup.md

@@ -0,0 +1,28 @@
+---
+title: "Popup"
+ms.date: "03/30/2017"
+f1_keywords: 
+  - "AutoGeneratedOrientationPage"
+helpviewer_keywords: 
+  - "Popup control [WPF]"
+  - "content [WPF], Popup control"
+  - "popups [WPF]"
+  - "controls [WPF], Popup"
+ms.assetid: 36a4320f-91ce-4f5f-9621-7934de3eff77
+---
+# Popup
+The <xref:System.Windows.Controls.Primitives.Popup> control displays content in a separate window that floats over the current application window.  
+  
+ The following illustration shows a <xref:System.Windows.Controls.Primitives.Popup> control that is positioned with respect to a <xref:System.Windows.Controls.Button> that is its parent:  
+  
+ ![Popup illustration](./media/popup/popup-picture-button.jpg)  
+  
+## In This Section  
+ [Popup Overview](popup-overview.md)  
+ [Popup Placement Behavior](popup-placement-behavior.md)  
+ [How-to Topics](popup-how-to-topics.md)  
+  
+## Reference  
+ <xref:System.Windows.Controls.Primitives.Popup>  
+  
+## Related Sections