I was browsing through some GFX Docs and landed in the Users KB and the Switch statement caught my eye.
Just a minor Typo that support can correct
Its "necessary" given the standard and Rep TJ maintains.
http://www.amibroker.org/userkb/2011/04/22/using-iif-if-and-switch-functions/
Case Matches should be
case "MA10":
Plot( MA( C, 10 ), "MA10", colorBlue, styleLine );
break;
case "MA50":
Plot( MA( C, 50 ), "MA50", colorBlue, styleLine );
break;
case "MA100":
// and so on