Simple Add computer account to group

Hey all,

I am trying to do something quite simple, or what should be simple.  I am trying to simply add a computer account to a group with vRA with vRO.  Sounds simple with this workflow, Add computers to group members.  However, I need to pass in strings. 

I have been able to get the strings converted (or I thought) to the proper complex data types/

AD:UserGroup

Array/AD:ComputerAD.

The computer account part works fine with this code (stolen from here)

var computers = ActiveDirectory.getComputerADRecursively(computerName);

System.log("Computer count: "+computers.length);

for each (pc in computers){

  System.log("Checking computer: "+pc.name);

  if (computerName.toLowerCase() == pc.name.toLowerCase()){

  System.log("Found Computer: "+pc.name);

  return pc;

  }

}

// Nothing found so throw exception:

throw "No matching Computer found: " + computerName;

I tried to do the same thing for the group with this code.

var userGroup = ActiveDirectory.searchExactMatch("UserGroup",userGroup_str,1);

System.log("Checking user: "+userGroup);

It fails.  When I click on the variable after the fact, I can see the computers variable looks proper as it has the DN, etc, etc.  When I view the other variable, it doesn't look right.  When using this code to add the elements (the account to the group)

userGroup.addElements(adServer);

I get this error.

015-05-21 15:08:26.669] [I] TypeError: Cannot find function addElements in object DynamicWrapper (Instance) : [AD_UserGroup]-[class ch.dunes.ad.object.UserGroup] -- VALUE : UserGroup rest of the group DN is here....

I am not handling the array properly, and I am obviously not an expert.  Any help would be greatly appreciated.