Is there a macro to change the callout halo width/color?

I found this piece of code but don't know how to implement in the script environment.  Any help is awesome!

get HaloWidth() return Value; /*Number (Float64)*/ }
set HaloWidth(Value /*Number (Float64)*/) {}
*UPDATE.  my mistake, this is JS code.
Here is the VBA:
Property Get HaloWidth() As Double
Property Let HaloWidth(ByVal Value As Double)