@:generic
    public function showWindow<@:const T:Constructible<Void->Void>>():Void {
        for (index in 0...numChildren) {
            var child = getChildAt(index);
            if (Std.is(child, T)) {
                selectWindow(cast(child, Window));
                return;
            }
        }

        cast(new T(), Window).show();
    }