AdvMultiColumnDropDown autocomplete

Working with AdvMulticolumnDropDown and DBAdvMulticolumnDropDown I found useful the autocomplete behaviour of AdvMultiColumnDropDown, but it seems to work only if the items are created at design time.
When I fill the items list on the fly, usually reading data from a dataset, it doesn't work.
Is there a way (or a property that I missed) to recreate this feature or do I have to code it?

I noticed similar behaviour when converting to AdvMulticolumnDropDown. The autocomplete doesn't seem to work unless you load the data into the component inside a BeginUpdate...EndUpdate

It is correct that the lookuplist is updated in the EndUpdate call, so please always use BeginUpdate/EndUpdate to add data. This also benefits performance to add data.