item state chang item event event event sourc multipl combo box target object item multipl combo box select item object target multipl combo box model target object multipl model facad multipl target model facad multipl item item equal multipl model core helper set multipl target item multipl model uml factori delet multipl item item equal model facad multipl model core helper set multipl target model data type factori creat multipl item multipl model uml factori delet multipl multipl model core helper set multipl target model uml factori delet multipl 