This API allows to access the multiview component's content.

To query if a TopComponent is a multiview component, use {@link org.netbeans.core.api.multiview.MultiViews#findMultiViewHandler}. If a {@link org.netbeans.core.api.multiview.MultiViewHandler} instance is returned, it is a multiview component.
`MultiViewHandler` can be used to examine the multiview component.
Array of defined perspectives (elements) and the currently selected perspective are available.
The handler can be used to switch the current selection programatically.
Possible usecases include:

- Deciding wheather a certain TopComponentGroup shall be visible or not.
- Etc.