public void selectManufacturerSpecificCause (ManagementExtension val) {
     this.manufacturerSpecificCause_ = val;
     this.manufacturerSpecificCause_selected = true;
     
     
             this.gsm0408Cause_selected = false;
         
             this.gsm0902MapErrorValue_selected = false;
         
             this.ccittQ767Cause_selected = false;
         
             this.networkSpecificCause_selected = false;
                     
 }
 public void Add(ManagementExtension item) {
     this.Value.Add(item);
 }