Returns a layout that places its widgets absolutely relative to the panel.
An added widget's "position" style property determines how it is placed. The following positions are supported:
- top-left, top-center, top-right
- middle-left, middle-right
- bottom-left, bottom-center, bottom-right
If no position is specified, the widget will be placed behind (that is, with a lower z-index than) the positioned widgets.