properti comboboxmodel depict chang uml model method make sure chang combobox model equal todo function complet written inherit doc java bean properti chang listen properti chang java bean properti chang event model chang uml chang event evt build model evt attribut chang event evt properti equal properti set evt sourc target clearabl chang element evt object elem chang element evt elem contain elem add element elem mvw set select item outsid build model combo doe updat select issu build model set select item elem evt delet instanc event contain chang element evt object chang element evt remov element evt add associ event target valid event evt evt properti equal properti set evt sourc target object elem evt valu todo set select item elem object chang element evt add element evt remov associ event valid event evt evt properti equal properti set evt sourc target evt old valu intern extern select item todo set select item extern intern evt valu object chang element evt contain remov element evt sourc argo diagram evt properti equal properti set necessari let sure add element evt valu mvw set select item outsid build model combo doe updat select doe probabl appli case build model set select item evt valu build model 