>>Look at a combo box that is working. Then verify on the one that is broken the the combo's style is 2-DropDown List and the _INCSEEK value.
>>
>I could not figure out what it causing the problem. BTW, TAB is also not working for navigation between controls. I was trying to comment some commands to see, if they are responsible.
>
>In any case, I don't think we would change our main program, so I may just accept this behavior.

Interestingly the form works correctly in the compiled exe. Then I really should not worry.