ActionScript 3.0 :: Event.MOUSE_LEAVE - Sometime Function Doesn't Work?

Here is my scenario

1: I am using custom hand cursor in my application

2: When the mouse leaves the stage I am making my hand cursor invisible

3: Further I am using PV3D for animating plane.When the mouse moves in the stage the camera rotation is changed

4: When mouse moves out of the stage.the camera rotationY is set to zero

Problem:I am using

ActionScript Code:
stage.addEventListener(Event.MOUSE_LEAVE,hideMouse);
stage.addEventListener(MouseEvent.MOUSE_MOVE,moveMouse);[code]....

There are other animation added to this function also.So the function works well but sometimes when I move the mouse out of the window from middle of stage to its out,the function doesn't work.Meaning it works for some fraction of time and then hand cursor is shown and camera rotation is not set to zero.Is there any trick that must be done to force Event.MOUSE_LEAVE work properly.