Cubase LE 4 Mouse Wheel Zooming?

[LBTM]

So I've got a half finished project from another studio because the band wasn't happy with them. The only problem is that the project was in Cubase 4 LE and I had never used it, althought I've got it with an old pedalboard purchare. Today I've spent like 2 hours learning it and configuring it to act as Reaper, and I can say it works good so far. But the only thing I can't figure out is how to make it zoom in and zoom out with the mouse wheel. Any ideas?

 

[LBTM]

I didn't find how to do it but I'm getting used to the shortcut. Have you got any good Cubase 4 tricks?