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I found this document of use:
http://support.dell.com/support/edocs/software/svradmin/5.1/en/omss_ug/html/vdmgmt.html#1295931
Specifically:
The changes you make to the physical disk selection are displayed in the Selected Physical Disks table#Click Continue to go to the next screen or Exit Wizard if you want to cancel.
Hope this helps.
Daniel