Accessing underlying object of SWbemObject instance

Question

I'm using vbscript to interact with the WMI classes. I am querying the Win32_GroupUser class which is defined here https://msdn.microsoft.com/en-us/library/windows/desktop/aa394153%28v=vs.85%29.aspx.

In the definition, it has the following components:

class Win32_GroupUser : CIM_Component
{
  Win32_Group   REF GroupComponent;
  Win32_Account REF PartComponent;
};

My vbscript is as follows:

dim objWMIService, o, obj, test, test1, strComputer
strComputer = "."

Set objWMIService = GetObject("winmgmts:{impersonationLevel=impersonate}!\\"& strComputer & "\root\cimv2")
set obj = objWMIService.ExecQuery("select partcomponent,groupcomponent from win32_groupuser")

for each o in obj
    set test = objWMIService.ReferencesTo(o.groupcomponent)
    wscript.echo o.groupcomponent
    set test1 = test.itemindex(0)
    wscript.echo "test is a "&typename(test)&", test1 is a "&typename(test1)
    on error resume next
    for each j in test1.methods_ 'list all methods
        wscript.echo "Method: "&j.name
    next
    for each j in test1.properties_ 'list all properties
        wscript.echo "Property: "&j.name
    next
    i = test1.properties_("GroupComponent")
    wscript.echo "Groupcomponent is a " & typename(i)
    wscript.echo "GroupComponent: "&i

next

The output is

\\COMPUTER\root\cimv2:Win32_Group.Domain="TESTDOMAIN",Name="Schema Admins"
test is a SWbemObjectSet, test1 is a SWbemObjectEx
Property: GroupComponent
Property: PartComponent
Groupcomponent is a String
Groupcomponent: \\COMPUTER\root\cimv2:Win32_NTDomain.Name="Domain: TESTDOMAIN"

However I am having trouble trying to follow the reference to the GroupComponent; it keeps on coming out as a string and not as a win32_group object, hence I cannot access the properties such as SID etc.

How do I access the groupcomponent as a win32_group object and not as the string?