Change color of Elite Monster Affix

[Jembo]

Hello, I am trying to find a way to change the color of several Elite Monster Affixes in a PluginEnablerOrDisablerPlugin.cs file rather than changing the \Default\Monsters\EliteMonsterAffixPlugin File
When i run D3 it has the following (5) exections (see attached file).

Hud.RunOnPlugin<EliteMonsterAffixPlugin>(plugin => {
plugin.AffixDecorators = new Dictionary<MonsterAffix, WorldDecoratorCollection>();
AffixDecorators.Add(MonsterAffix.FireChains, new WorldDecoratorCollection(
new GroundLabelDecorator(Hud)
{
BorderBrush = importantBorderBrush,
TextFont = importantLabelFont,
BackgroundBrush = Hud.Render.CreateBrush(255, 170, 50, 0, 0),
}
));
});

Is this a possible way? If not what could be a better option ?

[KillerJohn]

with this line you create a new list of affix decorators which means all pre-defined will be gone.
plugin.AffixDecorators = new Dictionary<MonsterAffix, WorldDecoratorCollection>();

To use the Dictionary<> class, you have to have this line just where the namespace starts:
using System.Collections.Generic;

Even if you fix that, this is wrong: AffixDecorators.Add(........) because it is not a variable there... the proper format is:
plugin.AffixDecorators.Add(........)

But in case you just want to replace one, you could use something like this instead of re-creating the whole dictionary:
plugin.AffixDecorators[MonsterAffix.FireChains] = new WorldDecoratorCollection(
new GroundLabelDecorator(Hud)
{
BorderBrush = .................................//create a new brush,
TextFont = ............................. // create a new font,
BackgroundBrush = Hud.Render.CreateBrush(255, 170, 50, 0, 0),
});