// Get the selected List Box User Control items
int $windowId;
int $controlId;
int $indices[];
 
// First create a User Window to place the Control on
$windowId = `createWindow "MyWindow"`;
 
// Create the User Control on the Window. 
$controlId = `createListBox $windowId -multi`;
 
// Add some items to the List Box.
addListBoxItem $controlId "Item 1";
addListBoxItem $controlId "Item 2";
addListBoxItem $controlId "Item 3";
 
// Select the second and third items
selectListBoxItem $controlId 1;
selectListBoxItem $controlId 2;
 
// Get the selected items
$indices = `getListBoxSelItems $controlId`;
print $indices;