How to sort the groups based on records count in WinForms GridGroupingControl?

//CustomGroupSortOrderComparer
public class CustomGroupSortOrderComparer : IGroupSortOrderComparer
 {
     ListSortDirection sortDirection;
     public CustomGroupSortOrderComparer(ListSortDirection sortDirecti
     {
         this.sortDirection = sortDirection;
     }

     public int Compare(object x, object y)
     {
         Group gx = (Group)x;
         Group gy = (Group)y;
         //To get the Record Count of Grouped items
         object vx = gx.GetRecordCount();
         object vy = gy.GetRecordCount();
         if (sortDirection == ListSortDirection.Ascending)
             return ((IComparable)vx).CompareTo(vy);
         else
             return ((IComparable)vy).CompareTo(vx);
     }

     public string[] GetDependantFields(TableDescriptor td)
     {
         return new string[0];
     }
 }

'CustomGroupSortOrderComparer
Public Class CustomGroupSortOrderComparer
    Implements IGroupSortOrderComparer
    Private sortDirection As ListSortDirection

    Public Sub New(ByVal sortDirection As ListSortDirection)
        Me.sortDirection = sortDirection
    End Sub

    Private Function IComparer_Compare(x As Object, y As Object) As Integer Implements IComparer.Compare
        Dim gx As Group = CType(x, Group)
        Dim gy As Group = CType(y, Group)
        'To get the RecordCount of Grouped items
        Dim vx As Object = gx.GetRecordCount()
        Dim vy As Object = gy.GetRecordCount()
        If sortDirection = ListSortDirection.Ascending Then
            Return (CType(vx, IComparable)).CompareTo(vy)
        Else
            Return (CType(vy, IComparable)).CompareTo(vx)
        End If
    End Function

    Private Function IGroupSortOrderComparer_GetDependantFields(td As TableDescriptor) As String() Implements IGroupSortOrderComparer.GetDependantFields
        Return New String() {}
    End Function

//To Group the Column
SortColumnDescriptor cd = new Syncfusion.Grouping.SortColumnDescriptor("CategoryName");
 
//To add Grouped columns to GridGroupingControl
this.gridGroupingControl1.TableDescriptor.GroupedColumns.Add(cd);
 
//To set CustomComparer to SortColumnDescriptor
cd.GroupSortOrderComparer = new CustomGroupSortOrderComparer(ListSortDirection.Descending); 

'To Group the Column
Dim cd As SortColumnDescriptor = New Syncfusion.Grouping.SortColumnDescriptor("CategoryName")
 
'To add Grouped columns to GridGroupingControl
Me.gridGroupingControl1.TableDescriptor.GroupedColumns.Add(cd)
 
'To set CustomGroupSortOrderComparer to SortColumnDescriptor
cd.GroupSortOrderComparer = New CustomGroupSortOrderComparer(ListSortDirection.Descending)