This view is how you navigate between layers when working on your button. select the item in the tree and the settings for that option will appear to the right of the tree.
Default Options
Options that pertain to the overall features of the button can be found in the options panel when this item is selected.
Settings to specify how your button will appear when the mouse is over it on your web page. This requires that you use the JavaScript that is generated in your web page.
Each layer is represented in this tree. Select this root item and you can read up on how it is used in the button. Select the options below to adjust the design or colors for this layer.