[Closed] How to add knots to an edit spline modifier

I’m just starting out at this Maxscript stuff, so hopefully the solution is an easy one.

I have a spline, and with script I’m adding an edit spline modifer to it, and trying to subdivide it with additional knots. When I do this, however, the knots are applied to the base level, and not the edit spline modifier.

How can I add the knots to the modifier and not the base level?

Here’s my simplified code, which in this case is only trying to add one knot in the middle of the first segment on the first spline in the curently selected shape:

(
addModifier $ (Edit_Spline())
[size=1] refineSegment $ 1 1 .5
)

[/size]
Thanks in advance.