DataGrid can't sort IObservable column

[aguahombre]

v0.8.1
If I bind a DataGrid column to an IObservable property, I cannot sort the column data by clicking the column header.

In the example, the data cannot be sorted by the Stations column which is bound to an IObservable<string> property.

<DataGrid Grid.Row="0" Name="countries" Items="{Binding Countries}">
  <DataGrid.Columns>
	<DataGridTextColumn Header="Name" Binding="{Binding Name}" Width="*" />
	<DataGridTextColumn Header="Stations" Binding="{Binding Stations^}" Width="4*" IsReadOnly="True" />
  </DataGrid.Columns>
</DataGrid>

[FloridaMatt]

I'm seeing a similar behavior. This is on 0.9.10

First, when I add items to the bound IObservableCollection, they appear in inverse order.

Then, when I click any column header, the grid is sorted on the first column.

Except, the last item I added to the collection is always in the first row, while all the remaining rows are sorted.