private void RefreshCurrentGroup()
{
CurrentGroup.Clear();
int startIndex = _pageIndex * PAGE_SIZE;
for (int i = 0; i < PAGE_SIZE; i++)
{
if (startIndex + i < _itemList.Count)
{
CurrentGroup.Add(_itemList[startIndex + i]);
if (startIndex + i == _selectedIndex)
{
_itemList[startIndex + i].Selected = true;
}
}
}
}