| Class Summary | 
| BorderLayoutPresentationContext | Used to provide location-based access to the PlaceholderPresentationContextobjects contained in aBorderLayoutportal component, as well as other presentation-related attributes specific to theBorderLayoutin use. | 
| FlowLayoutPresentationContext | Used to provide access to presentation-related attributes specific to the FlowLayoutin use. | 
| GridLayoutPresentationContext | Used to provide access to presentation-related attributes specific to the GridLayoutin use. | 
| LayoutPresentationContext | Used to provide access to presentation-related attributes specific to the Layoutin use. | 
| PlaceholderPresentationContext | Used to provide access to presentation-related attributes specific to the Placeholderin use. |