Back button Wont work

I have created an app using appinvintor. The problem is when i hit the back button on my android it closes the whole application i just want it to go to the previous step or page, how would i cod开发者_StackOverflowe that

Currently you can't do that because right now we are given only one screen. But you can manipulate like this.

since beginning of 2012 there is the multiple screen feature in AI and now it is possible to catch the back button, see this example http://puravidaapps.com/backbutton.php Taifun