Edited Unassigned: Issue with ScatterSeries in latest NuGet versions (WPF) [10179]

It seems something has broken or changed regarding ScatterSeries in the latest NuGet packages.

I have a simple MVVM setup:
View:
```
<Window x:Class="TestApplication.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:oxy="http://oxyplot.codeplex.com"
xmlns:local="clr-namespace:TestApplication"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<local:MainWindowModel x:Key="viewModel" />
</Window.Resources>
<Grid DataContext="{StaticResource viewModel}">
<oxy:Plot x:Name="Plot1" Title="A Graph" Margin="10" Grid.Row="1" >
<oxy:ScatterSeries ItemsSource="{Binding Data}" MarkerSize="3" />
<oxy:Plot.Axes >
<oxy:LinearAxis Position="Left" Minimum="0" Maximum="10" />
<oxy:LinearAxis Position="Bottom" Minimum="0" Maximum="25" />
</oxy:Plot.Axes>
</oxy:Plot>
</Grid>
</Window>
```

ViewModel:

```
using OxyPlot;
using System.Collections.Generic;

namespace TestApplication
{
public class MainWindowModel
{
List<DataPoint> data = new List<DataPoint>()
{
new DataPoint(5,5),
new DataPoint(10, 6),
new DataPoint(15, 7),
new DataPoint(20, 5)
};

public List<DataPoint> Data
{
get { return data; }
}

public MainWindowModel()
{ }
}
}
```

If I reference the official packages from codeplex (2014.1.240.1) everything works fine. If I reference the latest NuGet package (2014.1.277.1) no points are rendered.

In addition to that, if I reference the older NuGet package 2014.1.271.1 I get a single point at (0,0).

I might have missed a breaking change in how the newer versions work, but it feels like something has broken in the ScatterSeries implementation.