New action button causes AddressLookup to stop working.

I created an action button to create a service order from the customer screen. The customization works great. The only problem is the Address Lookup seemed to stop working. Any Idea what may be causing this?

using PX.Data;
using PX.Objects.CR;
using PX.Objects.FS;
using System.Collections;
using PX.SM;


namespace PX.Objects.AR
{
  public class CustomerMaint_Extension : PXGraphExtension<PX.Objects.AR.CustomerMaint>
  {

         public class CustomerServiceOrderDac : IBqlTable{

            [PXString(4, IsFixed = true, InputMask = ">AAAA")]
            [PXUIField(DisplayName = "Service Order Type", Required = true)]
            [PXDefault(PersistingCheck = PXPersistingCheck.NullOrBlank)]
            [FSSelectorActiveSrvOrdType]

          public virtual string ServiceOrderType{ get; set; }
            public abstract class serviceOrderType : PX.Data.BQL.BqlString.Field<serviceOrderType> { }
        }

        public PXFilter<CustomerServiceOrderDac> pXFilter;

        public PXAction<Customer> CreateServiceOrderAction;

        [PXButton(CommitChanges = true, DisplayOnMainToolbar = true, Category = "Actions")]

        [PXUIField(DisplayName = "Create Service Order", MapViewRights = PXCacheRights.Select, MapEnableRights = PXCacheRights.Update)]


        protected virtual IEnumerable createServiceOrderAction(PXAdapter adapter) {

          WebDialogResult result = pXFilter.AskExt();

          if (result == WebDialogResult.OK){

                Customer customer = Base.BAccount.Current;

                if (customer == null) return adapter.Get();

                var Filter = pXFilter.Current;

                if (Filter == null) return adapter.Get();

                var serviceOrderEntry = PXGraph.CreateInstance<ServiceOrderEntry>(); //Field Service Graph

                if (serviceOrderEntry == null) return adapter.Get();


                FSServiceOrder fsServiceOrder = new FSServiceOrder()
                {
                    CustomerID = Base.BAccount.Current.BAccountID,
                    SrvOrdType = Filter.ServiceOrderType
                };

                if (fsServiceOrder.SrvOrdType == null)
                {
                    const string ErrorMessage = "Service Order cant be blank";

                    throw new PXSetPropertyException(ErrorMessage, PXErrorLevel.Error);

                }

                PXLongOperation.StartOperation(Base, delegate ()
                {

                    fsServiceOrder = serviceOrderEntry.ServiceOrderRecords.Insert(fsServiceOrder);

                    throw new PXRedirectRequiredException(serviceOrderEntry, null);


                });




            }
            return adapter.Get();
        }

        public override void Initialize()
        {
            base.Initialize();

            Base.action.AddMenuAction(CreateServiceOrderAction);
        }

    }

  }

the address lookup