Dual monitors in clamshell mode with Diamond external card

hi, using late 2009 mbp 17" has discrete nvidia geforce 9600m gt video card. mac being used in "clamshell" mode card powering external dvi samsung monitor. have connected diamond bvu-160/displaylink (discontinued model) usb monitor card connected vga monitor.

problem setup seem see bvu connected monitor main monitor. as result cannot drag tool bar off onto larger dvi monitor. can drag photos etc not bar. when open display preferences screen opens on both monitors display/arrangement/color window appears on vga monitor , dvi connected monitor offers display/Çolor choice.

know if how works? seems strange diamond/display link device takes control seem secondary.

know how resolve problem , tool bar onto main monitor? thanks.

 

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