Binding a Combobox inside a ListView - wpf

Question

I have a combobox in a ListView that I can bind to an itemsource. When selecting a value in the combobox, my selected item is not getting set. Can someone show me why my selected item (NumberOfIterations) is not getting set? The combobox works when I move it outside the ListView, making me thinkg that I do not have the binding completely correct, but I cannot figure out what is wrong. I use the SimpleMVVMToolkit framework.
<ListView Grid.Row="1" Grid.Column="2"
ItemsSource="{Binding SequenceListItems}"
SelectedItem="{Binding SequenceListItemSelected}"
ItemContainerStyle="{StaticResource alternatingListViewItemStyle}"
AlternationCount="2">
<ListView.View>
<GridView>
<GridViewColumn Header="# of Iterations" Width="125">
<GridViewColumn.CellTemplate>
<DataTemplate>
<StackPanel>
<ComboBox ItemsSource="{Binding
SequenceEditorViewModel.Iterations, Source={StaticResource ViewModelLocator}}"
SelectedItem="{Binding Path=NumberOfIterations, Mode=TwoWay}" SelectedIndex="0"
FontWeight="Bold" VerticalAlignment="Center" Width="60" />
</StackPanel>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
</GridView>
</ListView.View>
</ListView>
ViewModel Items...I am not using a Model at this time
// Constructor
public SequenceEditorViewModel()
{
// Populate the Iterations for displaying in the combobox in the gridview.
for (int x = 1; x <= 50; x++)
{
this.Iterations.Add(x);
}
}
//public property (Iterations is source for combobox and NumberOfIterations
//is for the selected item in the combobox)
public ObservableCollection<int> Iterations
{
get
{
return this.iterations;
}
set
{
this.iterations = value;
this.NotifyPropertyChanged(m => m.Iterations);
}
}
public int NumberOfIterations
{
get
{
return this.numberOfIterations;
}
set
{
this.numberOfIterations = value;
this.NotifyPropertyChanged(m => m.NumberOfIterations);
}
}