''Tray icon and tray tip window
If you have the gtk2-trayicon perl bindings installed, gmusicbrowser will put an icon in the tray : tray icon.
With it, you can :

    left-click : show/hide the gmusicbrowser windows
    middle-click : Play/Pause
    right-click : Menu with more controls
    wheel : change volume

In addition gmusicbrowser can display a popup window next to the tray icon when changing song or when the mouse hover over the tray icon. This popup window is fully customizable like the player and browser window. You can change between the few included layouts in the Layouts tab of the settings dialog.
The tray tip window works exactly like the player window, that means it can be used to select a song from the album by clicking on the song title, or even any song from the library by clicking on the artist name and right-clicking on the chosen artist and album...''
From your gmusicbrowser guide
I can not do any of them. i've installed gmb v 1.1.9-1 from ubuntu software centre. and i've installed gtk2-trayicon perl bindings (package named libgtk2-trayicon-perl or perl-Gtk2-TrayIcon) from dependencies but as you can see there is no trayicon: http://imgim.com/ekrang%C3%B6r%C3%BCnt%C3%BCs%C3%BC2012-06-0900:56:12.png
please help  :'( i love gmusicbrowser :)

see http://forum.gmusicbrowser.org/index.php?topic=558.msg2655#msg2655

The infos on the website are a bit old, it seriously need updating.
The gtk2-trayicon perl bindings are no longer needed in v1.1.x but Unity only shows a few while-listed tray icons because they want to replace trayicons with icons in a menu bar, of course this doesn't really work with gmb's trayicon as it is (at least to me) mostly there as a hotspot to pop-up gmb's "traytip" window.