Editing WoW:UI XML tutorial (section)

=== Layers and Textures ===
There are five [[XML/DRAWLAYER|levels]] of [[layer]]s, although in practice you will often only assign objects to three of the five.   Of these three, BACKGROUND is in the back, ARTWORK is in the middle and OVERLAY is in front.  The only way to be certain of where and how much of your object is visible is to assign it to a specific layer.

BACKGROUND - Level 0. Place the background of your frame here.<BR />
BORDER - Level 1. Place the border art of your frame here .<BR />
ARTWORK - Level 2. Place the artwork of your frame here.<BR />
OVERLAY - Level 3. Place your text, objects, and buttons in this level<BR />
HIGHLIGHT - Level 4. Place your text, objects, and buttons in this level<BR />
*Elements in the '''HIGHLIGHT''' Layer are '''automatically shown or hidden''' when the mouse enters or leaves!
*For Highlighting to work you need '''enableMouse="true"''' in your ''<Frame>'' attributes.


''Note: The above are capitalized for a reason. See example:''<BR />
<pre>
<Layers>
  <Layer level="BACKGROUND">
    ...
  </Layer>
  <Layer level="ARTWORK">
    ...
  </Layer>
  <Layer level="OVERLAY">
    ...
  </Layer>
</Layers>
</pre>