How to show waiting in Flash CS3

Hi All,

I have 2 movieclip with thousands of children and to initialize each takes around 1 sec. When I am switching between these 2 movieclips the objects on stage stops responding for this period of time. This gives an impression to the user as if the software is dead.
How can i show a wait sign(something like an hourglass) for this 1 sec?

I tried using Event.INIT and Event.ADDED_TO_STAGE, but I am not getting it the way I mentioned above. Anyone with prior experience out there??

Thanks and Regards,
Hafiz