description (tooltip) in Window works wrong (Vaadin 7.0.1)

Hi,

tooltip (description) of a component within window disappears only if the mouse cursor leaves that window.
Otherwise tooltip is displayed forever.

FF 19.0 & Chrome, Vaadin 7.0.1

java code:
Window win = new Window();
VerticalLayout ve = new VerticalLayout();
ve.setSizeFull();
this.setContent(new VerticalLayout());
TextField la = new TextField(“Textfield”);
la.setDescription(“textfield - description”);
ve.addComponent(la);
ve.addComponent(new Label(“Label”));
win.setContent(ve);
this.getUI().addWindow(win);

Can you reproduce it?

Is it bug?

Can you create a ticket for it?