Editable combobox focus problem

hi, im using as3 and components. here i make a *combobox.editable=true; *i type something inside… then click outside, the combobox doesnt loose focus. i tried to write stage.focus=null;. but i got d following error

ArgumentError: Error #2025: The supplied DisplayObject must be a child of the caller.
at flash.display::DisplayObjectContainer/removeChild()
at fl.controls::ComboBox/close()
at fl.controls::ComboBox/fl.controls:ComboBox::onStageClick()

thanx for help in advance…