if you mean the wpf tooltit toolkit, you can do it like this:
<dg:DataGridComboBoxColumn Header="String Column" SelectedItemBinding="{Binding Path=RoleProperty}"> <dg:DataGridComboBoxColumn.ItemsSource> <CompositeCollection> <system:String>Employee</system:String> <system:String>Contractor</system:String> <system:String>Supplier</system:String> </CompositeCollection> </dg:DataGridComboBoxColumn.ItemsSource> </dg:DataGridComboBoxColumn>
in this, the displayed items have the RoleProperty property. you will also need to define the xnl namespace at the top of your xaml (with the rest of them, for example:
xmlns:system="clr-namespace:System;assembly=mscorlib"
to include a namespace. (to access the strings)
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