If you make a selection in a ComboBox,
then call clearSelection() on the combobox,
then try toi select the same item,
the selected item will not display in the combobox

I am attaching sample code. In the sample code:

1) select 'a' - 'a' displays
2) click reset button - 'a' disappears
3) select 'a' - 'a' does NOT appear and it should

The issue is major when the combobox only has a singe item