<sg:GcSpreadGrid Name="gcSpreadGrid1" ItemsSource="{StaticResource mySource}" SelectionPolicy="Range" SelectionUnit="Cell" SelectionBackground="Red" SelectionForeground="Blue" SelectionBackgroundUnfocused="Brown" SelectionForegroundUnfocused="Gray" HeaderSelectionOptions="ColumnHeader|RowHeader"> <sg:GcSpreadGrid.SelectionBorder> <sg:BorderLine Color="Black" Style="MediumDashDot"/> </sg:GcSpreadGrid.SelectionBorder> </sg:GcSpreadGrid> <ComboBox ItemsSource="{Binding SelectedItems, ElementName=gcSpreadGrid1}" SelectedItem="{Binding SelectedItem, ElementName=gcSpreadGrid1}" DisplayMemberPath="Name"/>