ShowAllRecords in SelectItem

I have a SelectItem with an optionDataSource. During scrolling a have a delay on drawing which I don’t want it.
I know that the ListGrid has the showAllRecords which draws all the rows at once. Since my SelectItem has a small and limited number of items, I would like to avoid the lazy drawing.

How can I activate the showAllRecords on the inner ListGrid of the SelectItem?

Does the solution implies the use of autochild? Any suggestion is welcomed!

Solution:

pickListProperties: {showAllRecords:true}