Skip tabs for specific columns

[neo_xaml]

I have 5 columns towards the end of the code named DataGridTextColumn and I'd like to skip them when the user clicks tab. Is there an easy way to do this, I've tried with KeyboardNavigation.IsTabStop="False" but that did not make a difference.

            <dg:DataGrid.Columns>
                <!--CellStyle="{StaticResource MyCellStyle}"-->
                <dg:DataGridTextColumn  IsReadOnly="True"  Header="" Binding="{Binding Path=TimeID}" Visibility="Hidden"    />
                <dg:DataGridTextColumn  KeyboardNavigation.IsTabStop="False" IsReadOnly="True" Header="Route Priority" Binding="{Binding Path=RoutePriority}" MinWidth="100" />
                <dg:DataGridTextColumn KeyboardNavigation.IsTabStop="False" IsReadOnly="True" Header="Job Address" Binding="{Binding Path=JobAddress}" MinWidth="100" />
                <dg:DataGridTextColumn KeyboardNavigation.IsTabStop="False" IsReadOnly="True" Header="Permit #"  Binding="{Binding Path=PermitNumber}" MinWidth="100" />
                <dg:DataGridTextColumn KeyboardNavigation.IsTabStop="False" IsReadOnly="True" Header="Inspection Type"  Binding="{Binding Path=TimeOptionEntry}" MinWidth="100" />
                <dg:DataGridTextColumn KeyboardNavigation.IsTabStop="False" IsReadOnly="True" Header="Start Time"  Binding="{Binding Path=StartTime}" MinWidth="100" />
                <dg:DataGridTextColumn KeyboardNavigation.IsTabStop="true" IsReadOnly="True" Header="End Time"  Binding="{Binding Path=EndTime}" MinWidth="100" />
                <dg:DataGridTemplateColumn Header="" Visibility="Visible" MinWidth="50" MaxWidth="50" x:Name="SelectedGridItem">
                    <dg:DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <Button Content="Delete" KeyboardNavigation.IsTabStop="False" Foreground="Black" FontSize="12" VerticalAlignment="Center" MaxWidth="50"
                                     Click="VoidButton_Click" Tag="jobid" Uid="{Binding Path=TimeID}"  Visibility="Visible" />