How to use a ListBox in a CellContentTemplate

How to use a ListBox in a CellContentTemplate

I have a Class called Planner with the usual properties (Name, Address, etc.) and an ObserveableCollection(Of Planner). I use this collection as follows:

cvsPlanners.Source= <the ObserveableCollection mentioned above>

I want to use a ListBox in a gridcontrol to display the name property. This is my XAML:

<xcdg:Column FieldName="PlannerID" Title="Planner"> <xcdg:Column.CellContentTemplate> <DataTemplate> <ListBox ItemsSource="{Binding Source={StaticResource cvsPlanners}}" DisplayMemberPath="FullName" SelectedValuePath="PlannerID"> </ListBox> </DataTemplate> </xcdg:Column.CellContentTemplate> </xcdg:Column>

But this is not working – a name appears in the cell but not in a ListBox and not the correct name.
What is my error?