Debian Jessie, gnome-panel no menu.

[Mario <nutrinfnon@gmx.com>]

Hi,

 I have installed Debian 8 Jessie (amd64) on samsung N150.

With old installation Debian 7.8 I was using netspeed applet on top 
panel bar and cpu-load and sensors applets on bottom one.

Now with new installation Debian 8, I can't invoke panel menu with 
alt-right_mouse_button. So I can't insert applets on panels.

I read about metacity window manager issue alt key, but on my system 
there isn't metacity. I don't understand which window-manager has been used.

How to invoke panel menu?
How to add applets to panel?


Thanks