disabled select items in plugin

Hi,

How can i disabled items in a select (inside a Plugin)?
[code]
...
...
contents:[
{
id:"info",
name:'info',
label:'Tab',
elements:[
{
type : 'select',
id : 'modul',
label : 'Bitte wählen Sie ein Modul',
items : [ [ 'Basketball' ], [ 'Baseball' ], [ 'Hockey' ], [ 'Football' ] ],
...
...[/code]