Question How to display the elements of a ScrollView in another color when hovering / selecting

Hello,

I developed a tool for the editor that derives from EditorWindow.
In OnGUI, I have a ScrollView which contains Labels (I have tried Boxes as well).
I would like to change the color of the text on the Labels / Boxes depending on their state (i.e., normal, hover, selected).
I tried defining a new GUIStyle, setting normal.textColor and hover.textColor, and passing it to the Labels / Boxes, but it is not working (the color does not change when hovering).
Can someone shed a light on what I am doing wrong, or share a very simple example that should work?
Thank you!