sc_btn_display Cannot work on Gird/Form's Application Link

I know how to use sc_btn_display and used for many times.

And in Form Application there’s no error.

I have a Grid Application and Form Application, which are linked by application link. And There’s form’s New button on the grid. And when I use sc_btn_display(‘new’, ‘off’), it doesn’t work. And the buttons I added manually such as btnDelete, btnRun there’s no problem.

How’s that?