It does not get disable by using below statement :
myTxt.textField.mouseWheelEnabled = false;
You also need to stop propagation of that event.
myTxt.addEventListener(MouseEvent.MOUSE_WHEEL, disableMouseHandler, true);
function disableMouseHandler(event:MouseEvent):void {
event.stopPropagation();
}
You need to add both the above codes together to disable mouseWheel.
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