title: Corona, creating an item in a loop using a timer, that needs an internal timer
body: <p>so im currently giving app development a shot. Ive been programming in corona for nearly 2 weeks and have hit my first proper road block. My problem is that ive created an item ( called a pointball ( its a little circle ball that you need to tap )). the pointball is called every 2 seconds and is given random coords and an event loop for handling a tap event. My problem, is that i would like to make it so that after 4 seconds each pointball disappears, which i currently cannot do because if i do the timer inside the item it gets called once and the timer isn't called for long enough. If its outside it throws up an error as it cannot see the contents inside the class. Here is the code ( i know its messy, and i know its inefficient, please focus on the problem and not my horrible code style )</p>
  
  <pre><code>function spawnball()
          local pointball = display.newImage("pointball.png")
          pointball.x, pointball.y = math.random(30,spawnrange2),math.random(30,spawnrange)
          pointball.type = "standard"
          pointball.id = ("point")
          physics.addBody(pointball, "dynamic", {friction=0, bounce = 0})
          pointball.myName = ("destructible")
          pointball.num = 0
          pointball.plus = pointball.num + 1
          pointball.touch = function( self,event )
  
              if event.phase == "ended" then
                  self:removeSelf()
                  score1 = score1 + 1
                  typenum = typenum + 1
                  if typenum == 25 then
                      level = level + 1
                      typenum = 0
                  end
              end
              return true
          end
  
          pointball:addEventListener("touch", pointball)
      end
  
  end
  
  function starter()
      tutorial2 = false
      timer.performWithDelay( 2000, spawnball, -1)
  end
  </code></pre>
  
  <p>after the intro starter gets called and it spawns a ball every 2 seconds ( as seen with the ( 2000, spawnball, -1 ). Now i need a way to add a timer inside the actual class!! if you can help, i will be so grateful. </p>