Use the Tween class to transition the window's current width and height properties to their final width and height. Register a function to receive one of the tween's "motionChange" event so you can reposition the window accordingly when its w and h are changed. You'll need to measure the window's bounds and position at each step to make sure it's not outside the screen bounds, or smaller/larger than allowed. How you resize the interior stage content is up to you...
Thanks for your answers！ It has been resolved!
I use the Resize and TweenEvent.TWEEN_UPDATE, and it dose work!