function ggbOnInit() {[br]ggbApplet.registerAddListener("comprobar");[br]}[br][br]function comprobar(obj) {[br]if (ggbApplet.getObjectType(obj) == "point") {[br]ggbApplet.evalCommand("l1=Prove(SOLSOL==" + obj + ")");[br]var resultado = ggbApplet.getValue("l1");[br][br]if (resultado == 1) {[br]ggbApplet.setValue("vf", 1);[br]} else {[br]ggbApplet.setValue("vf", 0);[br]}[br]}[br]}