How to get the whole row count of datasource of xamGrid for databinding?

We tried using IValueConverter to construct summarytext 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>
                            <VisualStateManager.VisualStateGroups>
                               ............................
                            </VisualStateManager.VisualStateGroups>
                            <Border x:Name="AddNewRowElem" Background="{TemplateBinding Background}" BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}">
                                
                                <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 we are using this "CustomSummaryStyle" in SummaryRowSettings of Xamgrid ColumnLayout as below.
           <ig:XamGrid x:Name="xamGridFL"
                       PageIndexChanging="xamGridFL_PageIndexChanging"
               RowExpansionChanging="xamGridFL_RowExpansionChanging"
                                        AutoGenerateColumns="False"

                                        >
      <ig:XamGrid.Columns>
                            <ig:ColumnLayout Key="SolutionElements" HeaderVisibility="false"
                                                ColumnLayoutHeaderVisibility="Never"
                                                DeleteKeyAction="None"
                                             >
                                <ig:ColumnLayout.RowSelectorSettings>
                                    <ig:RowSelectorSettingsOverride Visibility="Collapsed" />
                                </ig:ColumnLayout.RowSelectorSettings>
                                <ig:ColumnLayout.Columns>
                                        <ig:TextColumn HeaderText="{Binding Path=Description,       Key="SECodeDescription" Width="0.29*" MinimumWidth="10">
                                            <ig:TextColumn.SummaryColumnSettings>
                                                <ig:SummaryColumnSettings >
                                                    <ig:SummaryColumnSettings.SummaryOperands>
                                                        <ig:CountSummaryOperand IsApplied="True">
                                                        </ig:CountSummaryOperand>
                                                    </ig:SummaryColumnSettings.SummaryOperands>
                                                </ig:SummaryColumnSettings>
                                            </ig:TextColumn.SummaryColumnSettings>
                                        </ig:TextColumn>

     </ig:ColumnLayout.Columns>
                <ig:ColumnLayout.PagerSettings>
                                        <ig:PagerSettingsOverride AllowPaging="Bottom" PageSize="25" Style="{StaticResource DefaultPagerStyle}"/>
                                </ig:ColumnLayout.PagerSettings>

                                    <ig:ColumnLayout.SummaryRowSettings>
                                        <ig:SummaryRowSettingsOverride Style="{StaticResource CustomSummaryStyle}"   AllowSummaryRow="Bottom" SummaryScope="ColumnLayout" SummaryExecution="AfterFilteringBeforePaging" />
                                    </ig:ColumnLayout.SummaryRowSettings>
and code for RowCountConverter is as below:

public class RowCountConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            string summaryText;
            int totalNestedRowsCount, currentPageIndex;
            int x = 0, y = 0;
            int nestedGridPageSize = LifeCycle.NestedGridPageSize;

            bool success = int.TryParse(((Infragistics.SummaryResult)(value)).Value.ToString(), out totalNestedRowsCount);
            if (!success)
            {
                return value;
            }

            currentPageIndex = totalNestedRowsCount <= nestedGridPageSize ? 0 : LifeCycle.NestedGridPageIndex;
            int totalPages = totalNestedRowsCount / nestedGridPageSize;
            int roundedRecords = totalPages * nestedGridPageSize;
            int LastPageRecords = totalNestedRowsCount - roundedRecords;

            if (currentPageIndex == 0)            //After applying column filter
            {
                x = 1;
                y = totalNestedRowsCount >= nestedGridPageSize ? nestedGridPageSize : totalNestedRowsCount;

            }
            else
            {
                x = currentPageIndex == 1 ? currentPageIndex : ((currentPageIndex - 1) * nestedGridPageSize) + 1;

                y = currentPageIndex <= totalPages ? currentPageIndex * nestedGridPageSize : roundedRecords + LastPageRecords;

                currentPageIndex = 0;
            }

            if (y == 0)
                x = 0;

            summaryText = " Displaying records " + x + " through " + y + " out of " + totalNestedRowsCount;
            return summaryText;
        }

    }

But the problem with this is that,

As the row is expanded in xamgrid and we change the page number on nested grid, XamGrid's PageIndexChanging event updates the CurrentPageIndex.

But the RowCountConverter also gets raised for previous expanded row and in result "CurrentPageIndex" for previously expanded row also gets updated with newly expanded row's page index and therefor shows the wrong summary count.

Please advice.