Update ListSelect Options

Hello Community,

I'm totally new to vaadin, but I have Java experience so far, and I've worked with JavaEE and JSF already.
Vaadin is a very special way for me to develop web content.

I've already worked on some basics, but I have a problem now.
I made a ListSelect, so that the user can choose between different locations.

Now my idea was, to have three buttons. For example locations, order and product.
If I click on button order, i want to have orders in my ListSelect.
If i click on locations, i wnat locations in my selectbox.

I've tried to but Listeners on the buttons and than change the options of the ListSelect, but I wasn't successfully.

Is anybody able to help me? :)

Can you post some code.

It's will help us determine your problem.