TadvStringGrid versus Group Font Styles

What is the best way of setting the font style of a group?

For example:

- BMW (group) -> Set Bold
  - 1 series -> Keep regular
  - 3 series
  - 5 series
  - 7 series
- Mercedes (group)
  - A class
  - C class
  - E class
  - S class
- Audi (group)
- Porsche (group)
- Ferrari (group)

Thank you in advance for your help.

I found the solution myself by using HTML like '<b>', '<i>', '<u>'et cetera.