int $windowId;

int $controlId;

int $numItems;

// First create a User Window to place the Control on

$windowId = `createWindow "MyWindow"`;

// Create the User Control on the Window. 

$controlId = `createListBox $windowId`;

// Add some items to the List Box.

addListBoxItem $controlId "Item 1";

addListBoxItem $controlId "Item 2";

addListBoxItem $controlId "Item 3";

// Get the number of items

$numItems = `getNumListBoxItems $controlId`;

print $numItems;