MapRegion.xaml

<Page
    x:Class="MapTest.BlankPage1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:MapTest"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:Maps="using:Bing.Maps"
    mc:Ignorable="d">
    <Grid Background="{StaticResource ApplicationPageBackgroundThemeBrush}">
        <Maps:Map x:Name="bingmap" Credentials="Your Key" ZoomLevel="14" Margin="41,31,40,56"/>
    </Grid>
</Page>