Broken support for transparent gnome-panel

[pablo.t89]

The tray icon is implemented as gtktrayicon.TrayIcon, which seems quite similar to the TrayIcon class from the python-gnome-extras (egg). However, there is a known bug about that tray icon implementation - when the gnome-panel is transparent or has a background image, there is no transparency in the displayed icon - the rectangle in the system color is visible instead (the similar bug was widely discussed in case of other programs at https://bugs.launchpad.net/ubuntu/+source/banshee/+bug/403135 , sample screenshot here: http://launchpadlibrarian.net/32111146/Pidgin-non-transparent.png ).
The easiest solution is to use gtk.StatusIcon, which is recommended and provides the whole functionality of gtk.Image + gtk.EventBox + gtktrayicon.TrayIcon. That solves the bug and makes the code shorter.

[leigh123linux (leigh123linux-deactivatedaccount)]

Thank you for your patch.

It nearly solves the issue apart from when you left click it with the mouse, the volume sliders don't appear in the right place i.e they should be under the trayicon.

http://leigh123linux.fedorapeople.org/pub/screenshots/gmixer.jpg