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StackPanel is a simple layout panel that arranges its child elements into a single line that can be oriented horizontally or vertically. StackPanel controls are typically used in scenarios where you want to arrange a small subsection of the UI on your page. The following XAML shows how to create a vertical StackPanel of items. XAML <StackPanel> <Rectangle Fill="Red" Height="44"/> <Rectangle Fill="Blue" Height="44"/> <Rectangle Fill="Green" Height="44"/> <Rectangle Fill="Orange" Height="44"/> </StackPanel> The result looks like this.     Reference: https://docs.microsoft.com/en-us/windows/uwp/layout/layout-panels

RelativePanel lets you layout UI elements by specifying where they go in relation to other elements and in relation to the panel. By default, an element is positioned in the upper left corner of the panel. Reference: https://docs.microsoft.com/en-us/windows/uwp/layout/layout-panels

A split view control has an expandable/collapsible pane and a content area. Here is an example of the Microsoft Edge app using SplitView to show its Hub.     Reference: https://docs.microsoft.com/en-us/windows/uwp/controls-and-patterns/split-view

From scenario:Each item in the past must be linked to the next item in the future. Users must be able to scroll from past events to future events or from future events to past events. The app must only allow one level of detail to be linked to each item in the timeline. Here we can use a hierarchy with each parent node having only one single child node. Hierarchical structures are good for organizing complex content that spans lots of pages or when pages should be viewed in a particular order. The downside is that hierarchical pages introduce some navigation overhead: the deeper the structure, the more clicks it takes for users to get from page to page.We recommend a hiearchical structure when:You expect the user to traverse the pages in a specific order. Arrange the hierarchy to enforce that order. There is a clear parent-child relationship between one of the pages and the other pages in the group. There are more than 7 pages in the group. When there are more than 7 pages in the group, it might be difficult for users to understand how the pages are unique or to understand their current location within the group. If you don't think that's an issue for your app, go ahead and make the pages peers Reference: https://docs.microsoft.com/en-us/windows/uwp/layout/navigation-basics

From scenario: All code and markup must conform to the following style guidelines:Use resource dictionaries for styles that are used more than once. Use built-in properties of existing panels instead of using separate style objects. XAML resources are objects that are referenced from markup more than once. Resources are defined in a ResourceDictionary, typically in a separate file or at the top of the markup page. In this scenario the ResourceDictionary is defined in the ResourceDictionery.xaml file. You access members of the resource dictionary like any other dictionary. Reference: https://docs.microsoft.com/en-us/windows/uwp/controls-and-patterns/resourcedictionary-and-xaml-resource-references

Scenario: You must optimize the app using the following guidelines:You must minimize the time it takes to display content when an item on the timeline is selected. The app must respect memory and resource constraints for all devices. You use the NavigationCacheMode property to specify whether a new instance of the page is created for each visit to the page or if a previously constructed instance of the page that has been saved in the cache is used for each visit. The default value for the NavigationCacheMode property is Disabled. Set the NavigationCacheMode property to Enabled or Required when a new instance of the page is not essential for each visit. By using a cached instance of the page, you can improve the performance of your application and reduce the load on your server. Reference: https://msdn.microsoft.com/en-us/library/system.windows.controls.page.navigationcachemode(v=vs.95).aspx

The Hub class is for a panning view. Use a Hub to show different collections of data, either from the same source or from different sources. The Hub uses virtualization to load sections as the user pans. You can handle the SectionsInViewChanged event to respond to changes. References:https://docs.microsoft.com/en-us/uwp/api/Windows.UI.Xaml.Controls.Hub

Microsoft Hello Microsoft Hello provides simple multi-factor authentication using facial recognition (or iris, or fingerprints) that is used to access the Microsoft Passport private key stored in the secure TPM chip. For the first time, Microsoft has included the biometric software (middleware) in Windows 10 to support biometrics for authentication. In previous versions of Windows, the OEM (HP, Dell, Lenovo, etc) needed to add its own biometric middleware to support biometric authentication. From scenario: The app must meet the following requirements related to security:Use a multi-factor authentication (MFA) by using email and a verification code to identify the user. Securely store credentials and retrieve credentials. Automatically sign in the user irrespective of the device that is used to sign in to the app. Store the resource name within the app itself. Connect to an authentication app by using the URI schema fabrikam-security://oauth/.Note: Microsoft PassportMicrosoft has resurrected the Passport moniker for a new PKI credential system that requires multi-factor authentication. Most interesting about Microsoft Passport is that it fully supports the Fast IDentity Online (FIDO) Alliance standards which means it will work with many web/cloud services without modification. The plan is that users of cloud services supporting FIDO is that there will no longer be passwords associated with the user’s account. Microsoft Passport involves a user logging onto the Windows 10 computer with multi-factor (PIN, face, iris, fingerprint, etc) and either creating a new account or associating an existing account with an IDentity Provider (IDP). Windows generates a public/private key pair with the private key stored securely outside of the Windows 10 OS. The public key is associated with the account so that a challenge can be sent that can only correctly respond to the IDP. Another key point to the Microsoft Passport credential system is that the user needs to enroll every device used to access the service (IDP). Reference: https://adsecurity.org/?p=1535

Box 1: NoBox 2: YesBox 3: NoFrom scenario: the following code was usedPassWordVault vault = new PasswordVault(); var credential = vault.RetrieveAll(); You have several options for retrieving user credentials from the Credential Locker after you have a reference to the PasswordVault object. You can, as in this question, retrieve all the credentials the user has supplied for your app in the locker with the PasswordVault.RetrieveAll method. Reference: https://docs.microsoft.com/en-us/windows/uwp/security/credential-locker