Lays out it's children in a horizontal row.
Because this layout positions it's children absolutely, the container will have no height. A height must be specified directly or by a parent layout.
The vertical position and height of children can be managed by using {@link #setHBoxLayoutAlign(HBoxLayoutAlign)}.
- TOP - Children are aligned horizontally at the top side of the container.
- MIDDLE - Children are aligned horizontally at the mid-height of the container.
- STRETCH - Children are stretched vertically to fill the height of the container.
- STRETCHMAX - Children heights are set the size of the largest child's height.