dot net list won't go to next page.

Hi,

My dot net codes are like below:

    public class InventorySummaryPage : Web
    {
        public override void BuildContents()
        {
            try
            {
                Record _RecordInventory = FindCurrentRecord("Inventory");
                GetTabs();
                VerticalPanel _vp = new VerticalPanel();
                _vp.AddAttribute("width", "100%");
                EntryGroup _InventoryScreen = new EntryGroup("InventoryNewEntry");
                _InventoryScreen.Title = "Inventory Detail";
                _InventoryScreen.Fill(_RecordInventory);
                _vp.Add(_InventoryScreen);
                List _listInventoryMovement = new List("InventoryMovementGrid");
                _listInventoryMovement.SelectSql = "SELECT * FROM InventoryMovement WHERE inmo_inventoryid=" + _RecordInventory.RecordId.ToString();
                _vp.Add(_listInventoryMovement);
                AddContent(_vp);
            }
            catch (Exception ex)
            {
                AddError(ex.ToString());
            }
        }
    }

The problem is, in my "_listInventoryMovement", I have 7 records and my grid size is 5, when I click on the next page, there is no response at all.

What went wrong?

I'm using sage crm 7.2b and 7.2 SDK.