Visual Editor and modal windows

I’m new using vaadin and I’m loving it but still, I have a few questions about visual editor…
Can visual studio create modal windows… because it always creates for default an absolute layout (Sorry for my English. I speak Portuguese)

It is not possible currently to directly create sub-windows with the visual designer.

But nothing prevents you to use your visually created components as content for your windows in your code. Just do

Window subWindow = new Window("My visual window", new MyVisuallyCreatedComponent());
subWindow.setModal(true);
...
getMainWindow().addWindow(subWindow);

ok thanks for the tip will try that