Why FieldSelecting event is not triggered?

Hello All,

I am trying to trigger FieldSelecting Event in a graph extension for EPApprovalProcess (ScreenID EP503010) but I am not sure why the event is not triggered while in the same extension RowSelected Event is triggered just fine. I had this issue in the past on a different graph that Generic Method was not working and with @Yuriy Zaletskyy guidance I switched to the traditional method DACName_FieldName_Event syntax style and worked fine (see below post). So I thought I had learnt from it so I tried both methods but it didn’t work. 

Please see the below code I have tried all possible methods but none of them are triggered.

using PX.Data;
using PX.Objects.EP;
using static PX.Objects.EP.EPApprovalProcess;

namespace MYTest
{
    // ScreenID EP503010
    public class MYEPApprovalProcessExt : PXGraphExtension<EPApprovalProcess>
    {
        public static bool IsActive() => true;

        // This Row Selected Event IS triggered
        protected virtual void _(Events.RowSelected<EPOwned> e, PXRowSelected baseHandler)
        {
            if (e.Row == null) return;
        }

        // The below Field Selecting Events are NOT triggered
        protected virtual void _(Events.FieldSelecting<EPOwned, EPOwned.noteID> e)
        {
            if (e.Row == null) return;
        }

        protected virtual void _(Events.FieldSelecting<EPOwned, EPOwned.noteID> e, PXFieldSelecting baseHandler)
        {
            if (e.Row == null) return;
        }

        protected void EPOwned_NoteID_FieldSelecting(PXCache cache, PXFieldSelectingEventArgs e)
        {
            if (e.Row == null) return;
        }

        protected void EPOwned_NoteID_FieldSelecting(PXCache cache, PXFieldVerifyingEventArgs e, PXFieldSelecting baseHandler)
        {
            if (e.Row == null) return;
        }
    }
}