Store sample load "idx/tests/testdata/countries.json"
By script, override onClick() and onExecute(), labelAttr="name", valueAttr="name", closable=false
By markup, override onClick() and onExecute(), labelAttr="name", valueAttr="id", closable=true, persist=true
Scrollbar test by using ajax request (The result is always from a same local test json file), url="./_data/TypeAheadData.json", type="json"