code: public Object get(ManagedObject mo, String propName)
  	{
  		return get(mo.getMOR(), propName);
  	}
docs: Get the value of cached property whose name is propName.
  You should NEVER change the returned data object.
  @param mo Managed object on which the cached property is requested
  @param propName Property name, can include "."
  @return the data object identified by the propName.
  NullObject.NULL if the data object is really null