Dropdown aus Array im Dialog

Try this code

var dialog = new Window("dialog"); 
    dialog.text = "Dialog"; 
    dialog.orientation = "column"; 
    dialog.alignChildren = ["center","top"]; 
    dialog.spacing = 10; 
    dialog.margins = 16; 

// PANEL1
// ======
var panel1 = dialog.add("panel", undefined, undefined, {name: "panel1"}); 
    panel1.text = "Panel"; 
    panel1.orientation = "column"; 
    panel1.alignChildren = ["left","top"]; 
    panel1.spacing = 10; 
    panel1.margins = 10; 

var _Liste = [
    ['Art1', 'Artikel 1'],
    ['Art2', 'Artikel 2'],
    ['Art3', 'Artikel 3']
]

var dropdown1_array = []; 
for(var i = 0; i < _Liste.length; i++){
    dropdown1_array.push(_Liste[i][0]);
    }

var dropdown1 = panel1.add("dropdownlist", undefined, undefined, {name: "dropdown1", items: dropdown1_array}); 
    dropdown1.selection = 0; 
    dropdown1.preferredSize.width = 100; 

dialog.show();

Best

Sunil