Modify NinjaTrader 7 Dynamic Property View

[Description("Numbers of bars used for calculations")]
[GridCategory("Parameters")]
public int Period {
    get {return iPeriod;} 
    set {iPeriod = Math.Max(1, value);}
}

public class tF_TestAnn : Strategy, ICustomTypeDescriptor
{
        [Description("ANN trade mode.")]
        [GridCategory("Parameters")]
        [RefreshProperties(RefreshProperties.All)]
        public  ENAnnMode AnnMode { get; set; }
 
        private void ModifyProperties(PropertyDescriptorCollection col)
        {
            if( AnnMode != ENAnnMode.Backtest )
            {
                col.Remove(col.Find("NetType", true));
            }
            if( AnnMode != ENAnnMode.Live )
            {
                col.Remove(col.Find("BuyLevel", true));
            }
        }

        public AttributeCollection GetAttributes()
        {
            return TypeDescriptor.GetAttributes(GetType());
        }

        public string GetClassName()
        {
            return TypeDescriptor.GetClassName(GetType());
        }

        public string GetComponentName()
        {
            return TypeDescriptor.GetComponentName(GetType());
        }

        public TypeConverter GetConverter()
        {
            return TypeDescriptor.GetConverter(GetType());
        }

        public EventDescriptor GetDefaultEvent()
        {
            return TypeDescriptor.GetDefaultEvent(GetType());
        }

        public PropertyDescriptor GetDefaultProperty()
        {
            return TypeDescriptor.GetDefaultProperty(GetType());
        }

        public object GetEditor(Type editorBaseType)
        {
            return TypeDescriptor.GetEditor(GetType(), editorBaseType);
        }

        public EventDescriptorCollection GetEvents(Attribute[] attributes)
        {
            return TypeDescriptor.GetEvents(GetType(), attributes);
        }

        public EventDescriptorCollection GetEvents()
        {
            return TypeDescriptor.GetEvents(GetType());
        }

        public PropertyDescriptorCollection GetProperties(Attribute[] attributes)
        {
            PropertyDescriptorCollection orig = TypeDescriptor.GetProperties(GetType(), attributes);
            PropertyDescriptor[] arr = new PropertyDescriptor[orig.Count];
            orig.CopyTo(arr, 0);
            PropertyDescriptorCollection col = new PropertyDescriptorCollection(arr);

            ModifyProperties(col);
            return col;

        }

        public PropertyDescriptorCollection GetProperties()
        {
            return TypeDescriptor.GetProperties(GetType());
        }

        public object GetPropertyOwner(PropertyDescriptor pd)
        {
            return this;
        }
}