Hi, I use TColumnComboBox version 1.7.1.4
The OnChange event is not emitted when the user drop down items, move selection with keyboard up/down keys and select item by pressing Enter
When use mouse click, or combo items not dropped down - all ok, onChange fired
Bug only when list opened and keyboard used.
Can you please first check with the latest version v1.7.2.1?
I have a very heavy project, 1100+ forms. The migration from TMS 12.2 to 13.x requires many different checks and tests. I'll check the latest version, but it's not that easy 
I'll try to get ColCombo.pas from the latest distribution and check it only one
I migrate to latest VCL UI and test latest ColCombo.
All working fine, event fired!