How can I disable two finger pinch on iPad?

Question

Hi!
I'm trying to create a lab station where students will interact with a Keynote or PowerPoint presentation. However, I am running into problems trying to disable or lock certain actions so the students can't leave the presentation or program.
While in these programs, even if the students are locked into it, they still have the ability to exit the presentation or to minimize it. Since we the lab station won't have employee supervision, we won't be able to check on it frequently to make sure it is still set up correctly.
Is there a certain way to disable the "two finger pinch" touch screen command, or maybe another app that will allow us to have students to interact with pictures and slides. The requirements for this is that the iPad has to be independent of other computers, as well as being off a network.
We were pointed to Deep Freeze as a possible solution, but as far as we can tell, all that the program will do is create revertible snapshots of the hard drive, and not actually stop certain functions.
We tried to disable Multitasking Gestures, as well as turning on Guided Access, but neither of those options have helped.
Thank you for any support!

Answer 1

You can use a CHANGE event handler function to set the enabled property of the nonselected checkboxes to false.
cb1.addEventListener(Event.CHANGE, handleCBs);
cb2.addEventListener(Event.CHANGE, handleCBs);
cb3.addEventListener(Event.CHANGE, handleCBs);
function handleCBs(evt:Event):void {
     // change the status of all
     for (var i:int = 1; i<4; i++){
          this["cb"+String(i)].enabled = !this["cb"+String(i)].enabled;
     // enabled the selected checkbox
     evt.currentTarget.enabled = true;
That example will toggle the checkboxes from enabled to disabled and back again, so if one was to uncheck a checkbox, the rest would be enabled again.
Have you considered using radio buttons instead? They will only allow one selection at a time.