[Closed] HitTest() didn't work?

hi everyone
I write a modifier plugin
want use sub-object selection to pick object gizmo point.
I add Display(),HitTest() and GetWorldBoundBox()
but when I move cursor to object nearby and pick it, but HitTest() didn’t work?
I try set breakpoint in HitTest(), and 3dsmax not break it.
plz help me. thx