title: Simplest way to draw a grid with MonoTouch
body: <p>I want to draw a grid like this:
  <img src="https://i.stack.imgur.com/c6fcb.jpg" alt="enter image description here"></p>
  
  <p>I want the ability to style the color of each rectangle individual. I also want to be able to set a specific rectangle to be transparent.</p>
  
  <p>What is the simplest way to draw a grid like this in MonoTouch / C#?</p>