title: Flex mouse cursor "xor" color
body: <p>In an online mapping application I'm doing in Flex 3 I need a cursor for certain operations that has XOR coloring with the background.</p>
  
  <p>i.e. it is always the "negative" color of whatever pixels it stands above off (white on black, red on green, etc.).</p>
  
  <p>Can this be done with Flex? (Can I roll my own programmatic cursor?)</p>