The full story is too long to relate and involves the component which has given me more grief than any other - ComboBox. I'm pretty sure I established a while ago that there's a bug in using a ComboBox with a bound value for selectedIndex.
I have one whose dataprovider (and current selected index) are both highly dynamic (changing in response to changes in another combobox). There is a circumstance in which the displayed label does not update until you roll over the combobox, or sometimes click on it. Is there a brute force way I can make it update? I've tried various invalidateXXX methods.