How to use notification area (system tray) over indicatiors in Xubuntu

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http://askubuntu.com – Xubuntu has both a notification area (system tray) and indicators. I prefer the first one, as it allows me to hide items. Is there any way to force the apps that support both (e.g. tomboy, dropbox etc) to display their icons in the system tray and not their indicators? (HowTos)