DrawAction problem

I am try to use the Drawaction command but I can't figure out how to do what I need.

I would like to cancel a line drawn in a Graph and substitute it with another line

Here part of the code I wrote:

here it draw the line:

SetDrawEnv gstart,gname= name
SetDrawEnv/W=$namegraph linefgc= (65280,0,0)
SetDrawEnv/W=$namegraph xcoord= bottom,ycoord= left
DrawLine/W=$namegraph 0,a1,a
SetDrawEnv gstop

here to cancel the line and substitute it (this is the part that does not work)

Drawaction/W=$namegraph getgroup=lineasoglia, delete, begininsert
SetDrawEnv gstart,gname= name
SetDrawEnv/W=$namegraph linefgc= (65280,0,0)
SetDrawEnv/W=$namegraph xcoord= bottom,ycoord= left
DrawLine/W=$nomegraph 0,a,1,a
SetDrawEnv gstop
DrawAction endinsert

What is the problem?
Thanks