function ListOptions_Load() {
$item = &$this->ListOptions->Add("place");
$item->Header = "NUMBER"; // Set the column header (for List page)
$item->OnLeft = TRUE; // Link on left
$item->MoveTo(0); // Move the column to the specified index
$numr = 0;
}
and...
function ListOptions_Rendered() {
// Example:
$this->ListOptions->Items["place"]->Body = $GLOBALS["numr"]++;
}