openbox+fbpanel: highlight current window when using Alt + Tab

I am using openbox 3.6.1-8 on Debian 10. When I use Alt+Tab to cycle through open windows, I see the preview of the applications as I am cycling through them in the middle of my screen: unfortunately the icons in the taskbar do not change accordingly. Is there a way to have the currently highlighted application also be highlighted in the taskbar, so that I can see in the taskbar which application is currently selected in the "cycle-selector", too? The taskbar is actually provided by fbpanel, but I am not sure if fbpanel plays any role in this.