How to make CrossFade between 2 camera?

I have searching some way to do crossfade between 2 camera.

this is the old question:

http://answers.unity3d.com/questions/166898/screenwipe-crossfade-with-c.html

and I have downloaded a c# version

but there is some problem might happen in 4.3 version of unity

this is one of it

I use CrossFadeExample.cs(not Pro)

After I press Space bar

it just switch between 2 camera with no crossfade

Then if I use Pro version

there's some object with transparent will disappear while I press Space

but I need those object have the transparent material

another problem with pro is : its only fade between camera1 to camera 2

while it is camera 2 to camera 1

it will be no crossfade just suddenlly switch

or is there any new way to do this effect?

My first language is not English

so may be there's some solution I have searched but did not understand

I hope the answer could be step by step

please help, really thanks