Change color of polygon outline by map scale

[JohnBarnes]

ArcMap Desktop 10.0, Visusal Studio 8.0, vb.net.

I have a taxlot polygon layer.  I want to change the color of the polygon outlines after the map refreshes below 1:10,000 mapscale.

Am I looking at an addin extension?  I want this to happen automatically with not user input.  I have written multiple vb.net addins, all buttons or tools, but no extensions.

Can someone point me in the right direction.

Thanks,

jb

[LeoDonahue]

why not create a group layer in the TOC for this?  no programming necessary.

[JoshWhite]

I agree with Leo, I do something similar in my webmap and I controlled the symbology changes by scale in the mxd.  No need for extra work of programming which could produce strange results for some users.

[JohnBarnes]

Great idea ldonahue!

Sometime we need someone else to tell us the obvious.

Thanks.  Worked GREAT!

jb