I created a RadComboBox in the "Details" grid of the "EditAppointmentTemplate" that resembles the following code:

<telerik:RadComboBox Grid.Row="7" Grid.Column="1" 
                                             DataContext="{Binding Source={StaticResource viewModel}}"
                                            ItemsSource="{Binding CustomTypes}" 
                                            SelectedValue="{Binding SelectedItem.Value, Mode=TwoWay}" 
                                            SelectedValuePath="Name"
 />

I added a static resource that points to my view model in the resource dictionary:

<App:ViewModel x:Key="vm"/>

My view model has two objects, CustomTypes and CustomObject. The ComboBox correctly loads all of the types from CustomTypes, but it fails to bind the selected value from the CustomObject.  If I take the ComboBox out of the template and remove the Static Resource line, it works fine.  

Hi Ryan,

Can you send us a simple application that can be used to observe and debug the problem? We will reply with a suggestion asap.

Regards,
Valeri Hristov
the Telerik team