Update-ManualPool set Enable automatic assignment to No

I am trying to find the parameter in the Update-manualPool cmdlet to set the Enable automatic assignment to No (False). Has anyone tried this before?

sample command I am running.

Get-Pool -pool_id BrentTest_Pool | Update-ManualPool -pool_id BrentTest_Pool -isUserResetAllowed $true -allowProtocolOverride $false -AssignOnFirstLogon $false

I did run the get-help on the cmdlet but looks like there isn't anything listed but I though I would throw this out there anyway.

We are running View 6.01

Thanks for any help!