问题
I already have a Cascading Input Control with the Single Select Query type, based on a Multi-Select List of Values (Check Box), where the options are shown only when I select Brazil among the options United States, Italy, Brazil, Canada and Australia.
What I want now is to make the second Input Control a Multi-Select List of Values (Check Box) Cascading Input.
Which will keep showing its options only when I select Brazil in the Contry Input Control.
Is that possible? How can I achieve this behavior (since I don't have the option to put a Query like the Single Select Query Input Contro type)?
来源：https://stackoverflow.com/questions/61013694/how-to-make-a-multi-select-list-of-values-check-box-a-cascading-inpu-control-i