note: properties should be loaded automatically in the loader's
constructor to make them available immediately there's no need to call
XulManager.load() all property files in the locale tree should be
fix: multiple choices are experimental and need to improved substantily
todo: checkbox group allows multiple selection i need to extend input
interface to allow for multiple selections should i use comma separated
value for get/setText?
note: this class works also on jars inside jars, that is, the jar entry
inside the jar must be another jar you can either use the file or the http
protocol example: jar:file:///c:/sandbox/venus/venus.jar!