Scroll in combo

I have a combo box defined as: “view: ‘combo’, label: ‘myLabel’, id: ‘myId’ , datatype:‘json’, url:‘’”, i have about 20 values, when i click in combo i only can see five, i am trying to drag to show the next values but it doesn’t seem to work, i am testing in google chrome 12.0.742.122, is there any way to show scroll or any other way to show the next values without filtering?

The list of options in combo popup can be scrolled. Please provide the complete demo (use static json for data source) if the problem occurs.

My code was not correct, i already solved it, thanks