How do I edit Datagroups via PowerShell

Joe, you ARE the man! Thanks. And for all of you people out there....here is the fruit of my work with Joe's much helpful input. This script can easily be converted to do Data Groups of type String (my next task). I'm sure I could have tightened up things (like the check if the data group exists or not), but it's quite functional. Enjoy!

 ====================  
  ----------------------------------------------------------------------------  
   Created By Brandon Lay  
    
    *Use at your own discretion and your own risk*  
    
   PowerShell Script to Manage Data Groups of type Address.  
  - Create an Address Data Group  
  - Add Address Members to a Data Group  
  - Delete a Data Group  
  - Delete all members in an Address Data Group  
    
  Connection criteria (host IP, userid and pwd) embedded, so set vars below  
  Parameters to pass are Action, Data Group Name, Member to Add  
  For valid Parameters, check out the usage or run script w/o params  
    
  i.e. Addr_DataGroup_Mgmt.ps1 Action AddMember MYDataGroup .gif  
    
  ----------------------------------------------------------------------------  
  param($Action=$null, $DataGroup=$null, $NewMemberToAdd=$null)  
    
    
   Set the connection criteria for device below  
    
  $g_bigip="0.0.0.0"  
  $g_uid="username"  
  $g_pwd="password"  
    
  set-psdebug -strict  
    
     Check to make sure the iControlSnapIn is loaded; otherwise load it.  
    
  $checkSnapIn = Get-PSSnapIn iControlSnapIn -ErrorAction SilentlyContinue;  
  If ($checkSnapIn -notlike "iControlSnapIn") {Add-PSSnapIn iControlSnapIn};  
    
    
  -------------------------------------------------------------------------  
   function Create-AddrGroup  
  -------------------------------------------------------------------------  
  function Create-AddrGroup()  
  {  
  $Exists = "False"  
  $Class = (Get-F5.iControl).LocalLBClass  
  Check if Group Exists first  
  ForEach ($a in $Class.get_address_class_list())   
  {  
  if ($a -like $DataGroup)   
  {  
  $Exists = "True"  
  }  
  }  
  If ($Exists -eq "True") {GeneralError("DataGroup $DataGroup already exists!")}  
    
  $AddressClass = New-Object -TypeName iControl.LocalLBClassAddressClass   
  $AddressClass.name = $DataGroup  
    
   It seems that in order to create a group, you must specify at least one member  
     Sooo, I'll create a bogus entry and then call the Delete-AllMembers Function  
     to create an empty group.  
  $AddrEntry = New-Object -TypeName iControl.LocalLBClassAddressEntry   
   $AddrEntry.address = "1.1.1.1"   
   $AddrEntry.netmask = "255.255.255.255"   
      
   Assign the entry to the members member.   
    
   $AddressClass.members = (,$AddrEntry)   
  $Class.create_address_class(,$AddressClass)  
    
   Now call Delete-AllMembers to result in a new empty group  
    However if I call it too soon, apparently the new data group doesn't show up yet  
     So let's wait a couple seconds  
    
  Delete-AllMembers($DataGroup)  
    
  $Class.get_address_class_list()  
    
  }  
    
    
  -------------------------------------------------------------------------  
   function Add-AddrMembers  
  -------------------------------------------------------------------------  
  function Add-AddrMembers()  
  {  
    
  $Exists = "False"  
  Check if $NewMemberToAdd is null  
  if ($AddrMember=$null) {GeneralError("NewMemberToAdd must be specified in parameters for this Action")}  
    
  $Class = (Get-F5.iControl).LocalLBClass  
    
  Check if Group Exists first  
  ForEach ($a in $Class.get_address_class_list())   
  {  
  if ($a -like $DataGroup)   
  {  
  $Exists = "True"  
  }  
  }  
  If ($Exists -ne "True") {GeneralError("DataGroup $DataGroup doesn't exist!")}  
    
  $AddressClass = New-Object -TypeName iControl.LocalLBClassAddressClass   
  $AddressClass.name = $DataGroup  
    
   Allocate a AddressEntry structure with a    
   netmask of 255.255.255.255 for a Host address.   
    
   $AddrEntry = New-Object -TypeName iControl.LocalLBClassAddressEntry   
   $AddrEntry.address = $NewMemberToAdd   
   $AddrEntry.netmask = "255.255.255.255"   
      
   Assign the entry to the members member.   
    
   $AddressClass.members = (,$AddrEntry)   
    
    add the address class members   
    
   $Class.add_address_class_member( (,$AddressClass) )  
    
  }  
    
  -------------------------------------------------------------------------  
   function Delete-DataGroup  
  -------------------------------------------------------------------------  
  function Delete-DataGroup()  
  {  
  $Exists = "False"  
  $Class = (Get-F5.iControl).LocalLBClass  
  ForEach ($a in $Class.get_address_class_list())   
  {  
  if ($a -like $DataGroup)   
  {  
  $Exists = "True"  
  }  
  }  
  If ($Exists -ne "True") {GeneralError("DataGroup $DataGroup doesn't exist!")}  
    
  $Class.delete_class(,$DataGroup)  
  $Class.get_address_class_list()  
  }  
    
  -------------------------------------------------------------------------  
   function Delete-AllMembers  
  -------------------------------------------------------------------------  
  function Delete-AllMembers()  
  {  
  $Exists = "False"  
  $Class = (Get-F5.iControl).LocalLBClass  
    
  Check if Group Exists first  
  ForEach ($a in $Class.get_address_class_list())   
  {  
  if ($a -like $DataGroup)   
  {  
  $Exists = "True"  
  }  
  }  
  If ($Exists -ne "True") {GeneralError("DataGroup $DataGroup doesn't exist!")}  
    
  $Class.delete_address_class_member($Class.get_address_class((,$DataGroup)))  
  $Class.get_address_class_list()  
  }  
    
  -------------------------------------------------------------------------  
   function usage  
  -------------------------------------------------------------------------  
  function usage()  
  {  
  Write-Host "Usage: DataGroup_Mmgmt.ps1 Action DataGroupName (optional MemberToAdd)";  
  Write-Host "       Valid Actions are CreateGroup:AddMember:DeleteGroup:DeleteAllMembers";  
  Write-Host "       DataGroupName must be specified";  
  Write-Host "       MemberToAdd is only required for Action AddMember ";  
  exit;  
  }  
    
  -------------------------------------------------------------------------  
   function GeneralError  
  -------------------------------------------------------------------------  
  function GeneralError($ErrorMessage)  
  {  
  Write-Host $ErrorMessage;  
  usage;  
    
  }  
    
  -------------------------------------------------------------------------  
   Exception Handler  
  -------------------------------------------------------------------------  
  trap [System.Exception]  
  {  
  Write-Host "Exception Caught"  
  Write-Error $_.Exception.Message;  
  exit;  
  }  
    
  -------------------------------------------------------------------------  
   Main Application Logic  
  -------------------------------------------------------------------------  
  if ( ($Action -eq $null) -or ($DataGroup -eq $null) )  
  {  
  usage;  
  }  
    
    
  $success = Initialize-F5.iControl -HostName $g_bigip -Username $g_uid -Password $g_pwd;  
    
    
    
    
  If ($Action -eq "CreateGroup")   
  {Create-AddrGroup}  
  elseif ($Action -eq "AddMember")  
  {Add-AddrMembers}  
  elseif ($Action -eq "DeleteGroup")  
  {Delete-DataGroup}  
  elseif ($Action -eq "DeleteAllMembers")  
  {Delete-AllMembers}  
  else  
  {GeneralError("No supported Action specified!!!")}  
    
  =======================================