I know it might not be a popular topic about multi select of combobox here. I read a lot of previous threads about multiple select, and finally can make it satisfy my requirement. However, there is a defect of my implementation. I would try my best to describe my problem as clear as i can.
I have two comboboxes, say A and B. The items of B are depending on what's selected in A. When the App starts up, I select a item, then the items of B refreshes correctly, and i can also select items in B without problems. Now the defect comes, i unselect the item and select some other items, the items in B still can refresh correctly. But, when i select items in now this time, the selectionBox is not changing any more, with a blank always. I don't know what i've been missing.
I am creating a repository in github here email@example.com:hobbycamp/multicombobox.git. You guys can run it for real. Thanks for any help.