title: corona sdk - scene keep old items
body: <p>I'm using director , to move from one scene to another. I have a problem that the buttons and text fields from intor still in the top of screen when moving to any scene.</p>
  
  <p>How to remove items (text fields, btns from intro.lua screen) before move to next scene?</p>
  
  <pre><code>    enter code here    
  -- into.lua
  module(..., package.seeall)
  function new()
  --
  -- Project: NativeKeyboard2
  --
  
  local widget = require( "widget" )
  
  require("hijacks")
  
  local tHeight       -- forward reference
  
  -------------------------------------------
  -- General event handler for fields
  -------------------------------------------
  
  -- You could also assign different handlers for each textfield
  
  local function fieldHandler( textField )
      return function( event )
          if ( "began" == event.phase ) then
              -- This is the "keyboard has appeared" event
              -- In some cases you may want to adjust the interface when the keyboard appears.
  
          elseif ( "ended" == event.phase ) then
              -- This event is called when the user stops editing a field: for example, when they touch a different field
  
          elseif ( "editing" == event.phase ) then
  
          elseif ( "submitted" == event.phase ) then
              -- This event occurs when the user presses the "return" key (if available) on the onscreen keyboard
              print( textField().text )
  
              -- Hide keyboard
              native.setKeyboardFocus( nil )
          end
      end
  end
  
  -- Predefine local objects for use later
  local nameField, phoneField
  local fields = display.newGroup()
  
  
  
  -------------------------------------------
  -- *** Create native input textfields ***
  -------------------------------------------
  
  -- Note: currently this feature works in device builds or Xcode simulator builds only (also works on Corona Mac Simulator)
  local isAndroid = "Android" == system.getInfo("platformName")
  local inputFontSize = 18
  local inputFontHeight = 30
  tHeight = 30
  
  if isAndroid then
      -- Android text fields have more chrome. It's either make them bigger, or make the font smaller.
      -- We'll do both
      inputFontSize = 14
      inputFontHeight = 42
      tHeight = 40
  end
  
  nameField = native.newTextField( 40, 120, 200, tHeight )
  nameField.font = native.newFont( native.systemFontBold, inputFontSize )
  nameField:addEventListener( "userInput", fieldHandler( function() return nameField end ) ) 
  
  phoneField = native.newTextField( 40, 160, 200, tHeight )
  phoneField.font = native.newFont( native.systemFontBold, inputFontSize )
  phoneField.inputType = "phone"
  phoneField:addEventListener( "userInput", fieldHandler( function() return phoneField end ) ) 
  
  
  -- Add fields to our new group
  fields:insert(nameField)
  fields:insert(phoneField)
  
  -------------------------------------------
  -- *** Add field labels ***
  -------------------------------------------
  
  local defaultLabel = display.newText( "الاسم", 250, 120, native.systemFont, 18 )
  defaultLabel:setTextColor( 255, 0, 0 )
  
  local defaultLabel = display.newText( "رقم الجوال", 250, 160, native.systemFont, 18 )
  defaultLabel:setTextColor( 255, 0, 0 )
  
  -- -------------------------------------------
  -- -- Create a Background touch event
  -- -------------------------------------------
  
  
  local listener = function( event )
      -- Hide keyboard
      print("tap pressed")
      native.setKeyboardFocus( nil )
  
      return true
  end
  
  -- Determine if running on Corona Simulator
  --
  local isSimulator = "simulator" == system.getInfo("environment")
  if system.getInfo( "platformName" ) == "Mac OS X" then isSimulator = false; end
  
  -- Native Text Fields not supported on Simulator
  --
  if isSimulator then
  msg = display.newText( "الرجاء ادخال اسمك ورقم جوالك", 0, 280, native.systemFontBold, 12 )
  msg.x = display.contentWidth/2      -- center title
  msg:setTextColor( 255,0,0 )
  end
  
  -- -- Add listener to background for user "tap"
  -- bkgd:addEventListener( "tap", listener )
  -- display.remove( obj )
  -- obj = nil    
  
  local introGroup = display.newGroup();
  
      local background = display.newImage("graphics/intro_background.png")        
      local begin = display.newImage("graphics/begin_button.png")
      begin.x = 160; 
      begin.y = 400;
      begin.scene = "menu";
  
      introGroup:insert(background);
      introGroup:insert(begin);
  
      begin:addEventListener("touch", changeScene)
  
  return introGroup;
  
  end
  </code></pre>