I am having trouble getting labels to show up for my X-Axis.  I have a column series in which I  want the labels on the X-Axis to be the index of the item in the list.

xaml code

<ig:NumericYAxis x:Name="YAxis" MinimumValue="0" Interval="0.4" Label="{}{}" FontSize="9" MaximumValue="1.6" MajorStroke="DodgerBlue">
<ig:NumericYAxis.LabelSettings>
<ig:AxisLabelSettings Extent="35" />
</ig:NumericYAxis.LabelSettings>
</ig:NumericYAxis>
<ig:CategoryXAxis x:Name="XAxis" ItemsSource="{Binding}" Label="{}{Category}">
<ig:CategoryXAxis.LabelSettings>
<ig:AxisLabelSettings Extent="20" VerticalAlignment="Bottom" FontSize="11"/>
</ig:CategoryXAxis.LabelSettings>
</ig:CategoryXAxis>

<ig:XamDataChart.Series>
<ig:ColumnSeries x:Name="Series1" ItemsSource="{Binding}" ValueMemberPath="BusVoltageMagnitude" Title="BusVoltageMagnitude" XAxis="{Binding ElementName=XAxis}" YAxis="{Binding ElementName=YAxis}" Brush="DodgerBlue" Outline="Black">
</ig:ColumnSeries>
</ig:XamDataChart.Series>

C# code behind

public static class GeoLocations
{
public static ObservableCollection<Bus> locations = new ObservableCollection<Bus>();
}

public class Bus
{

    public int BusVoltageMagnitude{get; set; }

}

I'm still very new to this so I'm hoping I'm just missing something easy here.