wicket close DropDownChoice when mouse is out of the open list boundaries

[Bri_515]

i'm writing a simple web app using wicket, in one page i have a simple DropDownChoice that the user need to select a name from the list i give him.my problem is that when the list is open i need that if the mouse is out of the open list boundaries the list will closed itself and if i click again the drop down list will open.