or
<telerik:GridViewDataColumn.CellEditTemplate> <DataTemplate> <DockPanel HorizontalAlignment="Stretch" VerticalAlignment="Top"> <telerik:RadDropDownButton DockPanel.Dock="Top" HorizontalAlignment="Stretch" Height="22" Content="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}}, Path=DataContext.AcctVm.SelectedAccount.Account_Code,Mode=TwoWay}" VerticalAlignment="Center" HorizontalContentAlignment="Left"> <telerik:RadDropDownButton.DropDownContent> <ContentControl Content="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}}, Path=DataContext.AcctVm.View}" VerticalAlignment="Stretch" Height="300" /> </telerik:RadDropDownButton.DropDownContent> </telerik:RadDropDownButton> </DockPanel> </DataTemplate></telerik:GridViewDataColumn.CellEditTemplate><scheduleView:RadScheduleView AppointmentsSource="{Binding Appointments}" Margin="10" ResourceTypesSource="{Binding ResourceTypes}" telerik:StyleManager.Theme="Windows7" TimeMarkersSource="{Binding TimeMarkers}" CategoriesSource="{Binding Categories}" x:Name="MyScheduleView" GroupHeaderContentTemplateSelector="{StaticResource GroupHeaderContentTemplateSelector}" FirstDayOfWeek="Monday" FirstVisibleTime="6:0:0" ActiveViewDefinitionIndex="1" DialogClosing="MyScheduleView_DialogClosing" SpecialSlotsSource="{Binding SpecialSlots}" SpecialSlotStyleSelector="{StaticResource SpecialSlotStyleSelector}" ToolTipTemplate="{StaticResource AppointmentToolTipTemplate}" Drop="MyScheduleView_Drop">