MACROMEDIA FLASH 8-COMPONENTS LANGUAGE Reference page 130

The following example is from a radio button renderer. If the item parameter is undefined,
then the cell may be scrolled out of the display area and should be visibly empty. An
statement is used to determine if the
undefined, the radio button is hidden by setting its
the radio button is updated with the new data and appears.
function setValue(str:String, item:Object, sel:String) : Void {
/* Hide anything normally rendered in the cell if item is undefined.
Otherwise update the cell contents with the new data.
*/
if (item == undefined) {
radio._visible = false; }
else {
trace(item.data + " " + item.label + " " + item.state + " " + sel);
radio.label = item.label;
radio.data = item.data;
radio.selected = item.state;
radio._visible = true;
}
}
128 CellRenderer API
parameter is undefined. If the
item
_visible
parameter is
item
property to ; otherwise,
false
if