In the exit event of txt1 put:if (this.rawValue >= 71 && this.rawValue <=84) { txt2.fillColor = "225,225,0"; }else {txt2.fillColor = "255,255,255";}In the exit event of txt2 put:if (this.rawValue >= 71 && this.rawValue <= 84) { this.fillColor = "255,0,0"; }else if (this.isNull) { this...