..ended up adding the color to the end of each theme's
easyui.css file.
.button-sep {
display:inline-block;
vertical-align:middle;
height: 24px;
border-left: 1px solid blue; // look for "border-left: 1px solid" to find the color for the theme
border-right: 1px solid red; // look for "border-right: 1px solid" to find the color for the theme
margin: 2px 1px;
}