Zoom in and out creating a photo collage

I can't find any way other than grabbing a control node.   I looked at a few collage tempaltes- none of them contain clipping masks, which would make things both better, and easier.

It sure does appear you have to maually resize the images- just like you do in photoshop elements.

I can easlilly make better collage templates that contain clipping masks in photoshop elements.