Making the selector show the CD - Description rather than just the CD

I have a selector that, after you select a value, only shows the “CD” of the field.  I want it to show the “CD - Description”.

When you click the lookup, you see this:

After you select a row, you see this:

I want it to show T1 - test1

Note that if I add DescriptionField = typeof(SSGCRServiceType.description))], the field clears out after the row is selected.  I don’t know why that occurs.  Maybe because the field value in the table is int?

Does anyone know what I need to modify in this select statement to make this happen?

#region UsrServiceTypeID
[PXDBInt]
[PXUIField(DisplayName = "Service Type", Required = true)]
[PXDefault(PersistingCheck = PXPersistingCheck.Null)]
[PXSelector(typeof(Search2<SSGCRServiceType.serviceTypeID, 
   InnerJoin<SSGCRServTypeRecTypeXR, 
   On<SSGCRServTypeRecTypeXR.serviceTypeID.IsEqual<SSGCRServiceType.serviceTypeID>>>,
   Where<SSGCRServTypeRecTypeXR.recordTypeID.IsEqual<CRCaseExt.usrRecordTypeID.FromCurrent>.
	   And<SSGCRServiceType.isActive.IsEqual<True>>.
	   And<SSGCRServTypeRecTypeXR.isActive.IsEqual<True>>>>),
	typeof(SSGCRServiceType.serviceTypeCD),
	typeof(SSGCRServiceType.description),
	SubstituteKey = typeof(SSGCRServiceType.serviceTypeCD))]
public virtual int? UsrServiceTypeID { get; set; }
public abstract class usrServiceTypeID : PX.Data.BQL.BqlInt.Field<usrServiceTypeID> { }
#endregion