I always marked the correct answers when the things worked well.
I marked this answer now because this one worked for me:
......
import flash.utils.getDefinitionByName;
import flash.utils.getQualifiedClassName;
......
var ClassRef: Class = Class(getDefinitionByName(getQualifiedClassName(match[i])));
var newMC:* = new ClassRef();
addChild(newMC);