xfce-panel not centered

[christine.noot]

How can you get xfce-panel to be centered so that free spaces 
left and right from xfce-panel have the same length ?
This is not annoying with a 768x1024 screen, but on my laptop, 
whose screen's resolution is 800x600, the result is that I can not see the whole xfce-panel, if I use two many desktops or two 
many menus on xfce-panel. The problem dos not come from the size 
of xfce-panel, but from the fact that it is not centered. 
At least, I would be happy if I could correct this default by hand.

I am using xfce-3.8.16-1
Any solution ?

C. Noot.


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