Double click on touch screen

hey there!

i have dynamic coding for a full screen toggle button that needs to be a “double click” button. its for a touch screen.
do you know how to allow a double click for a touch screen? from what I know, for touch screens you have to use the MOUSE_DOWN event. but i need to allow for a double click. i tried the DOUBLE_CLICK mouseEvent and set doubleClickEnabled to true but it does now work on the touch screen.
here is the code:

fsToggle.doubleClickEnabled = true;
fsToggle.addEventListener(MouseEvent.DOUBLE_CLICK, fullScreenToggle);
}

i could use DOWN and then measure an amount of time for the click to bring a function into play but im not sure how i would go about that either…

thanks for any tips or help!