In the grouping demo for MultiColumnComboBox (https://demos.telerik.com/aspnet-mvc/multicolumncombobox/grouping), the first group 'Argentina' is not displayed as a black label on the right. This is inconsistent with the way other groups are displayed.
This can pose a usability issue for example when there are only two groups. The second group has a black label on the right, but the first group does not.
To be consistent, the first group should also display as a black label on the right.