I have some code that was originally written under Flex 2, where a ComboBox's data provider is an array of objects, with the first element set to null. When this code is built under Flex 2, I can select the first item in the combo's dropdown list, and selectedItem returns null, which is what I expect and want. When the code is built under Flex 3, I can't select the null item. It's shown in the list, but mousing over it doesn't highlight it, and clicking it doesn't close the dropdown.
Is this a bug, or a new "feature" in Flex 3?
