Select2 does not display properly on searchbuilder button configuration

AlanKong

Description of problem:
Hi. I've got a problem with the searchbuilder and select2. When I clicked on the searching input box of the select2, the searchbuilder loses focus. Here are the screenshots. How could I fix this problem?

The code I use were mainly come from this example : https://datatables.net/extensions/searchbuilder/examples/customisation/plugin.html