Technically nothing has to be databound - you don't have to bind the edit portion or the dropdown - but then you need to manage the push/pull from the edit portion (i.e. the Value property) and populate the list in code. I'm not sure if that's what you mean by binding to two different sources.

Good grief. I swear that's what I tried the first time and it couldn't find the data binding of the ItemsProvider because the combobox was bound to something else.

Using the ItemTemplate in the normal way under XamComboEditor.ComboBoxStyle works fine for me and is actually a bonus because it shows only the ID in the display from the XamComboEditor's datacontext but in the drop down it shows ID and Name from the ItemProvider's ItemsSource which is something else I wanted to accomplish. Speaking of which, is there a way to do that normally without databinding to two different sources?

Thanks for all your help!

Does the dropdown have to display the city id & name or can it just show the name? If it can just show the name then you can just change the DisplayMemberPath of the itemsprovider to CityName. If it needs to show both then you can try setting the ItemTemplate of the ComboBoxStyle of the XamComboEditor but a ComboBox will use the ItemTemplate for the edit area as well so while in edit mode you will see the itemtemplate and when out of edit mode, you will see the value represented by the displaymemberpath of the itemsprovider.

 Mm, I'll try to explain.

Say I have data from an AddressBook. This contains a property called CityID (but does not contain a CityName property).

I also have data from another object - Cities. This contains all the possible cities that could be selected for an Address and has a CityID and a CityName. 

Now, my form which comes up displays the addresses. So my XamComboEditor shows the CityID for the address. That is, the editor itself is bound to the AddressBook data and its value is bound to CityID in AddressBook. This ensures that the initial selected value is the one supplied by the AddressBook data.

However, its ComboBoxItemsProvider is bound to the Cities data so that in the drop down menu it shows the list of all the other cities. This allows the user to change the City value in the address and have it propagate automatically to the AddressBook object.

<UserControl.Resources>

<igEditors:ComboBoxItemsProvider x:Key="cbipCities" DisplayMemberPath="CityID" ValuePath="CityID"/>

</UserControl.Resources>

...

<igEditors:XamComboEditor Name="xamCbo" ItemsProvider="{StaticResource cbipCities}" Value="{Binding CityID}" />

 With the following pseudocode set in code behind:

cbipCities.ItemsSource = Cities;

xamCbo.DataContext = AddressBook;

So this is all well and good and works. My question is, is it possible to get the XamComboEditor's DataTemplate to display the CityID and CityName from the Cities data source (contained in ComboBoxItemsProvider and not in XamComboEditor) instead of just the CityID which is set through the DisplayMemberPath of the ComboBoxItemsProvider?

 Or, if I managed to explain myself properly, would you suggest a different way of doing things? For sure it would be simpler to set the selected value of the XamComboEditor in code behind once the data has been loaded but then I will have to manually update any changes to the AddressBook object myself. Perhaps not a big deal but I have a lot of other data on the form which is automatically bound/updated. It doesn't seem right to have to manually do one of them.

I'm sorry but I still don't follow what you are doing. Now you have the Text property bound to the Id of the Items collection - you're not binding to the Id or Name of the data context. Can you post a small sample that shows the problem?