C# :: WPF Using Color Resource In Rectangle Stroke Color

Trying to define some global colors so I can use the one instance though-out my application. Here is my color code:

<Color x:Key="GlobalTextColor">#E0E0E0</Color>

But this color doesn't display in the list when I start to type {StaticResource ...}

This is the code where I'm trying to reference the color, see Stroke="{StaticResource GlobalTextColor}". GlobalTextColor doesn't actually come up in the list so won't work.

<Style x:Key="InputButton" TargetType="Button">
<Setter Property="Background" Value="#FF141414" />
<Setter Property="HorizontalAlignment" Value="Left" />

[Code].....