Milan,
You can preload the data into arrays (and convert the data to string while doing that). Then use the SET method:
METHOD SetItems( aItems, aList )
When you save the selected item no. you may need to convert it back to numeric.
The problem is that the data needs to be string for the combobox class which is the base class of dbcombo.
Another way would be to modify the dbcombo source. The downside is that you will either not automatically get any improvements to newer versions of DBCombo that come with FW.
Maybe the best thing would be to customize a copy of dbcombo and give it a new class name. That is probably what I would do, but if you are not familiar with writing classes this may take some effort for you.
James