I would like to be able to layer objects, lock the top layer, but still be able to move the middle/bottom layer objects freely. I can do this in ActivInspire. I use it for "hiding" math problems under a picture, such as a bag. The bag itself is on the top layer and locked, but the math problems underneath are free moving and can be grabbed with the mouse because the top layer is locked and no longer acknowledged by the mouse. This allows me to pull random problems out of the "bag" without students seeing them prior to being revealed.