Default order of field PXWeekSelector2

Hello everyone,

I want to change the default order of Selector Week to descending by Start date.

How to do it?

Here is the definition of field Week:

public abstract class weekId : PX.Data.BQL.BqlInt.Field<weekId> { }

		protected Int32? _WeekID;
		>PXDBInt]
		>PXUIField(DisplayName = "Week")]
		>PXWeekSelector2(DescriptionField = typeof(EPWeekRaw.shortDescription))]
		public virtual Int32? WeekID
		{
			get
			{
				return this._WeekID;
			}
			set
			{
				this._WeekID = value;
			}
		}