Need to search for a specific VCAC custom property from VCO

Does anyone have the code to search out a specific property?  What variable type should I store it in?  I want to loop through each custom property.  I can then do the search logic.

var properties = new Properties(); var virtualMachineId = 'e0bd1979-84bd-47ab-a069-95ec5f2a0ea6' properties.put("VirtualMachineID", virtualMachineId); System.log (vCACEntityManager.readModelEntity(host.id, "ManagementModelEntities.svc", "VirtualMachines", properties, null));

Thank you

-Stephen