AutoSelectComboBox

If there is only one match while typing a custom value in combobox, it selects the matched value in blur when either the user hit ENTER or leave focus from the field (clicking any other area outside of combobox).

The default behaviour of combobox is that when leaving the focus, it clears the value however with AutoSelectComboBox the value stay as it is and it can show a custom error massage if there is no exactly one match with the input.