https://haebi.kr/entry/FpSpread-%EC%BD%94%EB%94%A9-%EC%B0%B8%EA%B3%A0%EC%9A%A9
Creating a Header with Multiple Rows or Columns
https://helpcentral.componentone.com/NetHelp/SpreadNet6/ASP2/spweb-HeaderMulti.html
C-NET-spread-개발-시-유용한-코드-모음단축키-컬럼-로우-등
Column Header를 클릭했을 때 Sorting 시키려면 SetColumnAllowAutoSort 함수를 이용하면 된다.
출처: https://rea1man.tistory.com/entry/Farpoint-Spread-Column-Sort-시키기-SetColumnAllowAutoSort [Realman's World:티스토리]
spsGateDtlInfo.SetColumnAllowAutoSort(i, spsGateDtlInfo.ColumnCount, true);