ok thks,
but he built up a brand new Tchecklistbox class there, as much I understand.
How did you get to that conclusion? He's using a regular TCheckListBox.
Post #8 (Where my link points to)
he's using ThemeServices to draw the CheckBox (which is missing in your OwnerDraw-Version)
And he's using TextRect to draw his first Item of the CheckListBox in Bold.
And if you can set a font to bold for a single item, you can also change its color
EDIT: Attached Proof of concept
Note "LCLType" and "Themes" in Uses