AdvDbLookupComboBox fetches whole dataset

I Noticed that after assigning AdvDbLookupBox.listsource := SomedataSource the whole data set will be fetched. Can this be disabled? 
Normally we don't use large datasets in combos, but with some customers there is and this is causing form creating to slow down.

In order to be able to perform lookup, a fetch of the listsource dataset is necessary and is what is happening.