Start a subwindow

I am busy rewriting an application from Delphi to Vaadin (client)

I am looking for an example how I can start a modal window from an other window.

Example:

I have a main screen with 4 buttons. When I click on a button a new window should pop-up.
I had it working but certainly it gives errors. Who can help met with a an example.

Chris

I already solved it :-)

startProfilewindow = new Window("Profile Execution");
startProfilewindow.setModal(true);
ITKstartProfile sp = new ITKstartProfile("", dbProps1);
startProfilewindow.addComponent(sp);
startProfilewindow.setResizable(false);
mainWindow.addWindow(startProfilewindow);