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Hiding labels for Freeplane app will not work after restarting freeplane.
THis is because the application ID of freeplane is randomly generated everytime. It works initially, however restarting the freeplane app generated a new application ID, meaning after a restart the settings like hide label, combine etc will not work.
Leveres av UserEcho
You can try to create a shortcut and bind it with a specific Application ID.
One way achieving it is using win7appid:
http://code.google.com/p/win7appid/
If that won't work, there's no functionality in 7+ Taskbar Tweaker that can help, and because the use-case is so specific, I'm reluctant to add special functionality for it. You can either adjust the tweaker yourself using its source code, or remove that functionality from Freeplane, for example with a Windhawk mod.