The function of gumball problem.( MFC / Rhino 5 )

I use it to set my object position, but it is not easy.
May I set those functions by code ?

1.The selected object can set translucent and calculus depth( not always show the front ) so that I can easily know the join.

2.To set large arrows and lines size.

Tools -> Options -> Modeling Aids -> Gumball

May I set it through C++ code ?
And Which option can set let me clearly look the join part ?

In C++, you can use CRhinoGumballColors and CRhinoGumballSizes.

Dale, thank you.