dual monitor and task bar

Hi,
I have fedora 15 and the last fluxbox. When I need double screen I use:

xrandr --output VGA1 --mode 1024x768 --output LVDS1 --mode  1280x800 
--left-of VGA1

But in the VGA1 monitor I cannot see the taskbar of fluxbox.

Can you help me please?
M

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