environment a
initialshells:b
{
    menu b
    (
	button "Popup" 
	    popup:c
	    ;
	button "Quit" 
	    exit:0
	    ;
    )
    menu c
    (
	button "Popdown" 
	    popdown:c
	    ;
	button "Popup" 
	    popup:c
	    ;
    )
}
