Actionscript 3 :: Flex 4 ComboBox Stays Open When Filtered

I have a Flex 4 app with an external ItemRenderer inside of a DataGroup for a repeating form. The DataGroup dataprovider is an ArrayCollection (coll_sites). In the documentParent I have a trio of comboBoxes (Status, Year, Area) that trigger a filter function that operates directly on coll_sites.The itemRenderer has a series of textInputs and comboBoxes. Three of these comboBoxes are tied to fields in coll_sites (again, Status, Year and Area) that are filtered by the aforementioned parentDocument comboBoxes.The problem I am having is that in the itemRenderer when the field is one of the filtered ones, the itemRenderer ComboBox will not close. If it's not filtered, there is no problem. I have confirmed that the problem ComboBox updates the ArrayCollection appropriately, it just won't close unless another Item in the dropdown is selected.[code]In the ItemRenderer code above, the ComboBox for STATUS works exactly as it should but YEAR stays open after changing. In my full code, I have three such filtered fields and all three behave exactly the same. The other six fields which are not filtered, close appropriately.