>> Short answer is No, TIB_LookupEnh cannot work this way.

...

> Is there some possibility to add this characteristic in future? I
> don't know how much difficult is it, but it will be perfect to
> substitute tib_lookupcombo, since it have this problem with height
> of combobox.

Not sure. It will take some investigation.

> I think to be a big overhead have to add another tib_query only to
> emulate the main dataset to achieve it.

A pain, but not too much of a performance overhead if done correctly.

Either: Use the fake Param idea and never open the "main" dataset, or
using a normal field configuration, put the "main" dataset into search
mode but never perform the search.

I think either of those options would achieve the desired effect, but
I have not done any testing to see how well it works.

--
Geoff Worboys
Telesis Computing