Hi Giorgos, 

You cannot. The ValueList on the Combo is not settable. Why do you want to do this? If you want to use the same list both for the Combo and for other things, such as a ValueList in the grid, then you should just use the ComboEditor as your ValueList. UltraComboEditor implements the IValueList interface, so you can use the Combo itself as your ValueList without using a seperate ValueList with the same items.