Windows Phone 8.1 Silverlight and XAML
2 answers
Windows.UI.Xaml.Controls is Windows Phone 8.1 only (or better known as Universal App). If you don't like the controls that are already in Silverlight, Microsoft will release an extended set of controls for all Windows Phone Toolkits. You can get it using NuGet by right-clicking the References -> Manage NuGet Packages -> Search Tool) link and select Microsoft.
Add the namespace to your XAML and you are ready to go.
<phone:PhoneApplicationPage xmlns:toolkit="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone.Controls.Toolkit">
Windows Phone Toolkit CodePlex Project Page
List of all Toolkit controls on the toolbar
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