How to highlight the items in the ContextPrompt list for the current parameter in WinForms SyntaxEditor (EditControl)?

private void editControl1_ContextPromptUpdate(object sender, Syncfusion.Windows.Forms.Edit.ContextPromptUpdateEventArgs e)
{
   // Select the items that should be bolded
   if( e.List.SelectedItem != null )
   {
      IList list = editControl1.GetLexemsInsideCurrentStack(false);
      if(list == null ) return;
        int iBoldedIndex = 0;
        foreach(ILexem lexem in list )
        {
           if(lexem.Text == "," )
              iBoldedIndex++;
        }
        if(iBoldedIndex >= e.List.SelectedItem.BoldedItems.Count )
           e.List.SelectedItem.BoldedItems.SelectedItem = null;
        else
           e.List.SelectedItem.BoldedItems.SelectedItem = e.List.SelectedItem.BoldedItems[iBoldedIndex];
   }
}

Private Sub editControl1_ContextPromptUpdate(ByVal sender As Object, ByVal e As Syncfusion.Windows.Forms.Edit.ContextPromptUpdateEventArgs)
   ' Select the items that should be bolded
   If e.List.SelectedItem IsNot Nothing Then
      Dim list As IList = editControl1.GetLexemsInsideCurrentStack(False)
      If list Is Nothing Then
          Return
      End If
           Dim iBoldedIndex As Integer = 0
           For Each lexem As ILexem In list
    If lexem.Text = "," Then
       iBoldedIndex += 1
    End If
           Next lexem
           If iBoldedIndex >= e.List.SelectedItem.BoldedItems.Count Then
    e.List.SelectedItem.BoldedItems.SelectedItem = Nothing
           Else
   e.List.SelectedItem.BoldedItems.SelectedItem = e.List.SelectedItem.BoldedItems(iBoldedIndex)
           End If
   End If
End Sub