title: Adding rectangle in the background
body: <p>am new to lua and corona development and was following this tutorial from a book i just purchased, it teaches you how to add 3 white rectangles in the background to act as a background for some text we add later, when i type the code the boxes just stack to the left side and do not appear as they should be, am using <strong>Corona SDK Version 2013.2100 (2013.12.7)</strong> here is the code am using </p>
  
  <pre><code>-- adding rectangle in the background
  rect_upperBackground = display.newRect( 0, 0, 320, 175 )
  rect_upperBackground:setFillColor( 49,49,49 )
  rect_upperBackground:toBack( )
  
  rect_middleBackground = display.newRect( 0, 175, 320, 2 )
  rect_middleBackground:setFillColor( 0,0,0 )
  rect_middleBackground:toBack( )
  
  rect_background = display.newRect( 0, 0, 320, 480 )
  rect_background:toBack( )
  </code></pre>
  
  <p>Here is a picture of how it looks like on my end</p>
  
  <p><img src="https://i.stack.imgur.com/198mN.png" alt="snapshot from simulator"></p>