When using a DBLookupComboBox I've experienced the problem with its behaviour after switching from Lazarus 1.8.2 to 2.0. The help text for AutoComplete in Lazarus provides this description:
"Allows to select items from partial input, of the begin of the item text.
The first matching item is selected. The user can continue entering characters, until the desired (or no) matching item is selected."
The above is correct with Lazarus 1.8.2., but not with any version above that.
Has anyone else experienced this problem?