https://supportcenter.devexpress.com/ticket/details/t336345/comboboxedit-texteditstyles-disabletexteditor-case-sensitive
ComboBoxEdit TextEditStyles.DisableTextEditor case sensitive | DevExpress Support
Jan 22, 2016 - Hi, I have A ComboboxEdit with TextEditStyle = TextEditStyles.DisableTextEditor with items "Upper " et " lower" when end user enter key "U",
case sensitivedevexpresssupport