Minor Description
These would replace the existing "corner" component. When horizontal, top/left would define a component that appears immediately to the left of the tab buttons and bottom/right would occupy the space to the right. When vertical, the positions would be top/bottom.
Along with this change, we would also add button alignment properties (horizontal and vertical) to control the tab position between the corners. The corners would always be visible and the tabs would be placed in a Panorama between them.