How to set the Expander/collpase behavior for GridHeaderIndentCell in WPF DataGrid (SfDataGrid)?

<Style TargetType="syncfusion:GridHeaderIndentCell">
    <Setter Property="BorderBrush" Value="Gray"/>
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="syncfusion:GridHeaderIndentCell">
                <Border Background="Transparent"
                    BorderBrush="{TemplateBinding BorderBrush}"
                    BorderThickness="{TemplateBinding BorderThickness}"
                    Padding="{TemplateBinding Padding}">
                    <VisualStateManager.VisualStateGroups>
                        <VisualStateGroup x:Name="ExpansionStates">
                            <VisualState x:Name="Expanded">
                                <Storyboard>
                                    <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PART_CollapseCellPath" Storyboard.TargetProperty="(FrameworkElement.Visibility)">
                                        <DiscreteObjectKeyFrame Value="{x:Static Visibility.Collapsed}" KeyTime="0:0:0"/>
 
                                    </ObjectAnimationUsingKeyFrames>
                                    <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PART_ExpanderCellPath" Storyboard.TargetProperty="(FrameworkElement.Visibility)">
                                        <DiscreteObjectKeyFrame Value="{x:Static Visibility.Visible}" KeyTime="0:0:0" />
 
                                    </ObjectAnimationUsingKeyFrames>
                                </Storyboard>
                            </VisualState>
                            <VisualState x:Name="Collapsed">
                                <Storyboard>
                                    <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PART_CollapseCellPath" Storyboard.TargetProperty="(FrameworkElement.Visibility)">
                                        <DiscreteObjectKeyFrame Value="{x:Static Visibility.Visible}" KeyTime="0:0:0"/>
 
                                    </ObjectAnimationUsingKeyFrames>
                                    <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PART_ExpanderCellPath" Storyboard.TargetProperty="(FrameworkElement.Visibility)">
                                        <DiscreteObjectKeyFrame Value="{x:Static Visibility.Collapsed}" KeyTime="0:0:0"/>
                                    </ObjectAnimationUsingKeyFrames>
 
                                </Storyboard>
                            </VisualState>
                        </VisualStateGroup>
                    </VisualStateManager.VisualStateGroups>
                    <Grid Background="{TemplateBinding Background}" Margin="{TemplateBinding Padding}">
                        <Path Margin="7" x:Name="PART_CollapseCellPath"
                      Width="{TemplateBinding Width}"
                      Height="{TemplateBinding Height}"
                      HorizontalAlignment="Center"
                      VerticalAlignment="Center"
                      Data="F1M1464.78,374.21C1466.31,374.21,1466.94,375.538,1466.17,376.861L1435.89,429.439C1435.12,430.759,1433.87,430.823,1433.11,429.5L1402.82,376.827C1402.06,375.507,1402.69,374.21,1404.21,374.21L1464.78,374.21"
                      Fill="{TemplateBinding Foreground}"
                      SnapsToDevicePixels="True"
                      Stretch="Fill"
                      Stroke="{TemplateBinding Foreground}"
                      UseLayoutRounding="False">
                            <Path.RenderTransform>
                                <TransformGroup>
                                    <TransformGroup.Children>
                                        <RotateTransform Angle="270" CenterX="4" CenterY="4" />
                                    </TransformGroup.Children>
                                </TransformGroup>
                            </Path.RenderTransform>
                        </Path>
                        <Path x:Name="PART_ExpanderCellPath" Margin="7"
                      Width="{TemplateBinding Width}"
                      Height="{TemplateBinding Height}"
                      HorizontalAlignment="Center"
                      VerticalAlignment="Center"
                      Data="F1M1464.78,374.21C1466.31,374.21,1466.94,375.538,1466.17,376.861L1435.89,429.439C1435.12,430.759,1433.87,430.823,1433.11,429.5L1402.82,376.827C1402.06,375.507,1402.69,374.21,1404.21,374.21L1464.78,374.21"
                      Fill="{TemplateBinding Foreground}"
                      SnapsToDevicePixels="True"
                      Stretch="Fill"
                      Visibility="Collapsed"        
                      Stroke="{TemplateBinding Foreground}"
                      UseLayoutRounding="False">
                            <Path.RenderTransform>
                                <TransformGroup>
                                    <TransformGroup.Children>
                                        <RotateTransform Angle="0" CenterX="4" CenterY="4" />
                                    </TransformGroup.Children>
                                </TransformGroup>
                            </Path.RenderTransform>
                        </Path>
                    </Grid>
                </Border>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
    <EventSetter Event="MouseDown" Handler="GridHeaderIndentCell_MouseDown" />
</Style>

private void GridHeaderIndentCell_MouseDown(object sender, MouseButtonEventArgs e)
{
    var gridHeaderIndentCell = sender as GridHeaderIndentCell;
    IsExpanded = !IsExpanded;
    usetransition = true;
    VisualStateManager.GoToState(gridHeaderIndentCell, IsExpanded ? "Expanded" : "Collapsed", usetransition);
    usetransition = false;
    if (IsExpanded)
        this.dataGrid.ExpandAllDetailsView();
    else
        this.dataGrid.CollapseAllDetailsView();
}