When I place a TAdvDBComboBox on a form and double-click the Items the resulting editor is too small, obscuring the Ok and Cancel buttons. "Get stored values" is the last button visible along the bottom. The window is 233 by 306 pixels although I can see in the source it should be wider.
TMS Components version 8.3.3.0. The component version shows as 1.0.1.5.
This is in C++Builder 10.1 Berlin under Windows 10.