We have defined custom summary style for SummaryRowCellControl with IValueConverter as below:

       <Style x:Key="CustomSummaryStyle" TargetType="igPrim:SummaryRowCellControl">
            <Setter Property="FontSize" Value="11" />
            <Setter Property="VerticalContentAlignment" Value="Center" />
            <Setter Property="HorizontalContentAlignment" Value="Right"/>
            <Setter Property="Background" Value="{StaticResource SummaryRowBackgroundBrush}"/>
            <Setter Property="BorderBrush" Value="{StaticResource CellItemNormalBorderBrush}"/>
            <Setter Property="BorderThickness" Value="0,0,0,0"/>
            <Setter Property="Padding" Value="7,3"/>
            <Setter Property="SummaryDisplayTemplate" >
                <Setter.Value>
                    <DataTemplate>
                        <TextBlock Text="{Binding Converter={StaticResource RowCountConverter}}"/>
                    </DataTemplate>
                </Setter.Value>
            </Setter>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="igPrim:SummaryRowCellControl">
                        <Grid>
                                                       
                            <Border x:Name="AddNewRowElem" Background="{TemplateBinding Background}" BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}">
                                <!--<Rectangle Height="1" VerticalAlignment="Top" Fill="#7FFFFFFF" />-->
                                <StackPanel x:Name="SummaryDisplay" HorizontalAlignment="Right" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" Margin="{TemplateBinding Padding}"/>
                            </Border>
                            <Rectangle Fill="Transparent" Stroke="{StaticResource CellItemSelectedBorderBrush}" StrokeThickness="1" x:Name="ActiveRect" Visibility="Collapsed"></Rectangle>
                         
                        </Grid>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>

and applied "Count" summary operand in one of the column of XamGrid.

IValueConverter "RowCountConverter" which is defined in  "SummaryDisplayTemplate" property of summary style is used for counting the grid rows

Now my question is how to invoke this "RowCountConverter" from code behind.

Please suggest.