Bug 168888 [Wizards] PageTransition classes may need rename/reorg
bundles/org.eclipse.jface/src/org/eclipse/jface/dialogs/IPageTransitionProvider.java
/**
	 * Returns the currently selected page in the dialog.
	 * 
	 * @return the selected page in the dialog or <code>null</code> if none is
	 *         selected. The type may be domain specific. In the dialogs
	 *         provided by JFace, this will be an instance of
	 *         <code>IDialogPage</code>.
	 */
	Object getSelectedPage();
	
	/**
	 * Adds a listener for page changes in this page changing provider. Has no
	 * effect if an identical listener is already registered.
	 * 
	 * @param listener
	 *            a page transition listener
	 */
	void addPageTransitionListener(IPageTransitionListener listener);
	/**
	 * Removes the given page changing listener from this page changing provider.
	 * Has no effect if an identical listener is not registered.
	 * 
	 * @param listener
	 *            a page transition listener
	 */
	void removePageTransitionListener(IPageTransitionListener listener);
}