WoW:Layer

There are 3 levels of layers: BACKGROUND is in the back, ARTWORK is in the middle and OVERLAY is in front. If you want to be sure that a object is before another, you must specify the level where you want to place it.

BACKGROUND - Level 0. Place the background of your frame here. BORDER - Level 1. Place the artwork of your frame here . ARTWORK - Level 2. Place the artwork of your frame here. OVERLAY - Level 3. Place your text, objects, and buttons in this level HIGHLIGHT - Level 4. Place your text, objects, and buttons in this level

   * 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.