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/app-development/how-to-open-a-window.md

@@ -0,0 +1,22 @@
+---
+title: "How to: Open a Window"
+ms.date: "03/30/2017"
+dev_langs: 
+  - "csharp"
+  - "vb"
+helpviewer_keywords: 
+  - "windows [WPF], opening"
+  - "opening windows [WPF]"
+ms.assetid: 6b91b2bb-fda7-491d-a72e-139dd630a5b0
+---
+# How to: Open a Window
+This example shows how to open a window.  
+  
+## Example  
+ A window is opened by instantiating <xref:System.Windows.Window> and calling the <xref:System.Windows.Window.Show%2A> method. <xref:System.Windows.Window.Show%2A> opens a window and returns immediately without waiting for the new window to close. This type of window is also known as a *modeless* window, and doesn't restrict user input.  
+  
+ [!code-csharp[HOWTOWindowManagementSnippets#OpenNewWindowCODE](~/samples/snippets/csharp/VS_Snippets_Wpf/HOWTOWindowManagementSnippets/CSharp/MainWindow.xaml.cs#opennewwindowcode)]
+ [!code-vb[HOWTOWindowManagementSnippets#OpenNewWindowCODE](~/samples/snippets/visualbasic/VS_Snippets_Wpf/HOWTOWindowManagementSnippets/visualbasic/mainwindow.xaml.vb#opennewwindowcode)]  
+  
+## .NET Framework Security  
+ Instantiating <xref:System.Windows.Window> requires permission to call unsafe native methods (see <xref:System.Windows.Window.%23ctor%2A>).