Unable to select value, it is disappearing

Hello!

While selecting the value through selector ,it is disappearing.

And also forward and backward buttons are not working.

Can someone help me out.

Here is the code for reference

Dac:

 public abstract class assetCD : PX.Data.BQL.BqlString.Field<assetCD> { }
        /// <summary>
        /// A string identifier, which contains a key value. This field is also a selector for navigation.
        /// </summary>
        /// <value>The value can be entered manually or can be auto-numbered.</value>
        [PXDBString(15, IsUnicode = true, IsKey = true, InputMask = ">CCCCCCCCCCCCCCC")]
        [PXDBDefault]
        [PXUIField(DisplayName = "Asset ID", Visibility = PXUIVisibility.SelectorVisible)]
        [PXSelector(typeof(Search2<FixedAsset.assetCD,
            LeftJoin<FADetails, On<FADetails.assetID, Equal<FixedAsset.assetID>>,
            LeftJoin<FALocationHistory, On<FALocationHistory.assetID, Equal<FixedAsset.assetID>,
                And<FALocationHistory.revisionID, Equal<FADetails.locationRevID>>>,
            LeftJoin<Branch, On<Branch.branchID, Equal<FALocationHistory.locationID>>,
            LeftJoin<EPEmployee, On<EPEmployee.bAccountID, Equal<FALocationHistory.employeeID>>,
            LeftJoin<FAClass, On<FAClass.assetID, Equal<FixedAsset.classID>>>>>>>,
            Where<recordType, Equal<Current<recordType>>>>),
            typeof(assetCD),
            typeof(description),
            typeof(classID),
            typeof(FAClass.description),
            typeof(depreciable),
            typeof(usefulLife),
            typeof(assetTypeID),
            typeof(FADetails.status),
            typeof(Branch.branchCD),
            typeof(EPEmployee.acctName),
            typeof(FALocationHistory.department),
            Filterable = true)]
        [FARecordType.Numbering]
        [PXFieldDescription]
        public virtual string AssetCD { get; set; }

[PXDBString(15, IsUnicode = true, IsKey = true, InputMask = ">CCCCCCCCCCCCCCC")]
        [PXDBDefault]
        [IBPropertySelector(typeof(Search2<FixedAsset.assetCD,
        LeftJoin<FADetails, On<FADetails.assetID, Equal<FixedAsset.assetID>>,
        LeftJoin<FALocationHistory, On<FALocationHistory.assetID, Equal<FixedAsset.assetID>,
        And<FALocationHistory.revisionID, Equal<FADetails.locationRevID>>>,
        LeftJoin<PX.Objects.GL.Branch, On<PX.Objects.GL.Branch.branchID, Equal<FALocationHistory.locationID>>,
        LeftJoin<EPEmployee, On<EPEmployee.userID, Equal<FALocationHistory.custodian>>,
                    LeftJoin<FAClass, On<FAClass.assetID, Equal<FixedAsset.classID>>,
                    LeftJoin<IBResidentialInfo, On<IBResidentialInfo.assetID, Equal<FixedAsset.assetID>>>>>>>>,
        Where<FixedAsset.recordType, Equal<Current<FixedAsset.recordType>>, And<IBFixedAssetExt.usrIBIsProperty, Equal<boolTrue>>>>)
                 )]
        [PXSelector(typeof(Search<FixedAsset.assetCD>))]
        [IBPropertyNumbering]
        [PXFieldDescription]
        [PXUIField(DisplayName = IBConstants.PropertyID, Visibility = PXUIVisibility.SelectorVisible, TabOrder = 1)]
        protected virtual void FixedAsset_AssetCD_CacheAttached(PXCache cache)
        {
        }