MainWindow.xaml

<Window
    x:Class="BehaviorSample.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:i="using:Microsoft.Xaml.Interactivity"
    xmlns:local="using:BehaviorSample"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">

    <StackPanel Orientation="Horizontal" HorizontalAlignment="Center" VerticalAlignment="Center">
        <Border Background="LightBlue" Padding="12">
            <i:Interaction.Behaviors>
                <local:DragBehavior />
            </i:Interaction.Behaviors>
            <!--<Button x:Name="myButton" Click="myButton_Click">Drag me</Button>-->
            <TextBlock Text="move me" />
        </Border>

    </StackPanel>
</Window>