TIWBSSelect - How to load from query

[Comograma]

I'm trying to load values to a TIWBSSelect component, using a DataSource and a TIBQuery.
I'm loading TIWBSSelect.DataSource property with the TDataSource component and the TDataSource.DataSet property  with the TIBQuery component.
The sql query is loaded and opened but nothing happens, no values are loaded into the TIWBSSelect component.
What am I missing here?