Xailer & OZ Software

I am new to Xailer and trying to use TDbComboBox. I could see that it use
aItems and aItemsBound arrays to store the ComboBox option. But I want to
directly refer to a Database field instead. How can I do that ?
Typically, my tables are as follow :
Machine Master
MachineCode
MachineName
MachineTypeCode
Machine Type Master
MachineTypeCode
MachineTypeName
Now when preparing the Form of Machine Master, I want to show
MachineTypeName from Machine Type Master Tabel. How can I do it ?
Let me say that I amazed by the environment called Xailer. I have started
loving the same in a very short period !
TIA
Milan.