ListView DragDrop doesnt work on new project in VS2013 - wpf

Question

This is a really strange problem, I have a listview that I want to drop files onto, I know how to get the file info etc, and bizarrely I actually had it working fine, but then it seemed to just stop.
I have tried creating a new project with just a listview object, allowdrop=true, dragenter/drop events created, dragenter contains e.handled=true and e.effects = effects.none.
but the events just don't fire, I have a project that was created on an earlier version of VS, and this works fine !!
here is the xmal
<Window x:Name="mainWin" x:Class="droptest.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<Style x:Key="ColumnHeaders" TargetType="{x:Type GridViewColumnHeader}">
<Setter Property="Visibility" Value="Collapsed"/>
</Style>
</Window.Resources>
<Grid>
<ListView x:Name="ImageList" AllowDrop="True" HorizontalAlignment="Left" Height="204" Margin="65,69,0,0" VerticalAlignment="Top" Width="374" DragEnter="ImageList_DragEnter" Drop="ImageList_Drop" DragOver="ImageList_DragOver" DragLeave="ImageList_DragLeave">
<ListView.View>
<GridView ColumnHeaderContainerStyle="{StaticResource ColumnHeaders}">
<GridViewColumn/>
</GridView>
</ListView.View>
</ListView>
</Grid>
</Window>
and here is the code
namespace droptest
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
private void ImageList_DragEnter(object sender, DragEventArgs e)
{
e.Handled = true;
e.Effects = DragDropEffects.None;
}
private void ImageList_Drop(object sender, DragEventArgs e)
{
}
private void ImageList_PreviewDragOver(object sender, DragEventArgs e)
{
e.Handled = true;
e.Effects = DragDropEffects.None;
}
private void ImageList_PreviewDrop(object sender, DragEventArgs e)
{
}
private void ImageList_DragOver(object sender, DragEventArgs e)
{
e.Handled = true;
e.Effects = DragDropEffects.None;
}
private void ImageList_DragLeave(object sender, DragEventArgs e)
{
e.Handled = true;
e.Effects = DragDropEffects.None;
}
}
}
I don't think I am doing anything wrong, in fact I am sure I aren't, as I had it working..
any pointers would be much appreciated.