How to remove a Collection from a Distribution Point Group

$CollectionID = 'PS10001A'
$SiteCode = 'PS1'
$DistributionPointGroup = "New Distribution Group"
$DPGroupQuery = Get-WmiObject -Namespace "Root\SMS\Site_$SiteCode" -Class 'SMS_DistributionPointGroup' -Filter "Name='$DistributionPointGroup'"
$DPGroupQuery.DisassociateCollections($CollectionID)