An implementation of wax.Box, using a horizontal layout.
| Inherited from wax.Box: | boxSpacing |
| Inherited from wax.Element: | flex, contextMenu, tooltip, disabled, draggable, display |
| Inherited from wax.Box: | getSize, getChildSize, packChild |
| Inherited from wax.Element: | getContainer, add, remove, pack, empty, raise, hangsFrom, getDocX, getDocY, getMouseX, getMouseY, acceptDrop, drag, getDragElem |