JComboBox list based model - list

Question

In my program I use couple JComboBoxes with a simple list combo box model:
public class ListComboBoxModel<T> extends AbstractListModel implements ComboBoxModel {
protected List<T> list;
private T selection;
public ListComboBoxModel(List<T> list) {
this.list = list;
this.selection = getDefaultSelection();
}
protected T getDefaultSelection() {
if (list.size() > 0) {
return list.get(0);
} else {
return null;
}
}
#Override
public Object getSelectedItem() {
return selection;
}
#Override
public void setSelectedItem(Object anItem) {
selection = (T) anItem;
}
#Override
public int getSize() {
return list.size();
}
#Override
public T getElementAt(int index) {
return list.get(index);
}
}
And the problem is that when I add elements to the list that combobox is using it doesn't work as intended anymore. If I click on combo box, the list has correct length but all elements in there are empty so the list is all white. When I roll over an element it doesn't highlight. When I click anywhere in the list it always works as if I selected the recently added element. If I reduce list size back to original or even decrease it, combo box works as it should have.
To edit the lists that combo boxes use, I use JTables and the add method I implemented in their models.
public void add(T element) {
list.add(element);
fireTableDataChanged();
}
Any ideas how can I fix that?

Answer 1

Well if anyone were interested I solved problem by adding
fireContentsChanged(this, 0, getSize());
in a method that gets called when by table/list gets changed anywhere in the program using observer pattern.