I've created a BindingList and assigned it to the UXComboBox. So far, so good.

With the new version 2012 R1 SP1 I get the following error at runtime:

System.NullReferenceException: Object reference not set to an instance of an object.
at Intersoft.Client.UI.Controls.UXPopupManager.ShowOverlay(OverlayType type, UXPopup popup)
at Intersoft.Client.UI.Controls.UXPopupManager.ShowOverlay(UXPopup popup)
at Intersoft.Client.UI.Controls.UXPopupManager.Show(UXPopup popup, Boolean staysOpen)
at Intersoft.Client.UI.Controls.UXPopup. (Boolean isOpen)
at Intersoft.Client.UI.Controls.UXPopup. . . ()
at Intersoft.Client.Framework.DependencyObjectExtensions. . . (Object args)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)

While with the previous version it worked fine. It also works fine using the .NET default ComboBox.

The xaml code is the following:

<Intersoft:UXComboBox Name="comboProduct" ItemsSource="{Binding Path=Products, UpdateSourceTrigger=PropertyChanged}" SelectedValue="{Binding Path=Id, Mode=OneWay}" DisplayMemberPath="Description" Width="160" HorizontalAlignment="Right" VerticalAlignment="Center" Margin="0,8,0,0" Grid.Row="0" />