EditWindow.xaml

<Window x:Class="SnippetManager.EditWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        mc:Ignorable="d"
        xmlns:local="using:SnippetManager"
        DataContext="{Binding Source={StaticResource Locator}, Path=EditViewModel}"
        Title="EditWindow" Height="430" Width="668" Topmost="True">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="19*"/>
            <RowDefinition Height="182*"/>
        </Grid.RowDefinitions>
        <TextBox x:Name="TxtLabel" Height="23" Margin="10,10,9.6,0" TextWrapping="Wrap" VerticalAlignment="Top" Text="{Binding SnippetToEdit.Label, Mode=TwoWay}"/>
        <TextBox x:Name="textBox" Margin="10,3.066,9.6,9.6" Grid.Row="1"  Text="{Binding SnippetToEdit.Data, Mode=TwoWay}" TextWrapping="Wrap" AcceptsReturn="True"/>

    </Grid>
</Window>