void SelectIndex (int display_index)
{
/*
if (display_index == -1)
return;
if (MultiSelect)
UpdateMultiSelection (display_index, true);
else if (!GetItemAtDisplayIndex (display_index).Selected)
GetItemAtDisplayIndex (display_index).Selected = true;
SetFocusedItem (display_index);
EnsureVisible (GetItemIndex (display_index)); // Index in Items collection, not display index
*/
}