Features XBar integrates addons' GUI in one window. XBar integrates addons' setting or function access in popup menu. Enable Left/Right-Click in popup menu. Shows your addon info in popup menu tooltip. You only need to write one GUI. You can use any style, any size of GUI. It is not include libraries. You can use multi-pages in your addon. There are 3 types of page level. If you didn't install XBar the addon can also use. You can also add a button in XBar Thanks McBen's suggests.
Features XBar will auto create a button frame according your icon, you just only need to write a frame to load. Also work with XBar Addon Management. Show any status which you want, add Tooltip and click function. XBar Buttons support is still under build. Thanks suggests of McBen and Peryl.