Hello michaelgr1 ,

I was just wondering did you have a chance to try my suggestion. If you still need any assistance on the matter, please do not hesitate to ask.

Hello michaelgr1,

I have been looking into your question and I can suggest you create a style for the RowSelectorCellCotnrol in this style you can trigger new content template depending on the IsSelected property of the current selected row. In order to achieve this you can try the following style for example:

                        <Style TargetType="{x:Type igPrim:RowSelectorCellControl}">
                            <Style.Triggers>
                                <DataTrigger Binding="{Binding RelativeSource={RelativeSource Self}, Path=Cell.Row.IsSelected }" Value="True">
                                    <Setter Property="ContentTemplate">
                                        <Setter.Value>
                                            <DataTemplate>
                                                <Rectangle Fill="Red" Width="10" Height="10" />
                                            </DataTemplate>
                                        </Setter.Value>
                                    </Setter>
                                </DataTrigger>
                                <DataTrigger Binding="{Binding RelativeSource={RelativeSource Self}, Path=Cell.Row.IsSelected }" Value="False">
                                    <Setter Property="ContentTemplate">
                                        <Setter.Value>
                                            <DataTemplate>
                                                <Rectangle Fill="Aqua"  Width="10" Height="10"  />
                                            </DataTemplate>
                                        </Setter.Value>
                                    </Setter>
                                </DataTrigger>
                            </Style.Triggers>                         
                        </Style>

For additional refernce you can check the attached sample.

Please let me know if you need any additional assistance with this matter.