FocusShortcut opens ComboBox, but not closing on focus lost

Hello!
I've tried to create two ComboBox components with FocusShortcut listeners.
Fisrt listen to 'F1' and second listen to 'F4'.
I press 'F1' then first ComboBox take focus and open their container data.
Then i press 'F4' and second ComboBox take focus and open their container data, but first ComboBox is still opened.
At this point we have two opened ComboBoxes, but only last opened takes focus and can select item.

How can i control that with focus loose ComboBox close their items, and with takes focus it open their items?

I use Vaadin 7.7.6.

@Theme("valo")