Bug 273012 [Forms] NPE in FormPage.setActive(...)
bundles/org.eclipse.ui.forms/src/org/eclipse/ui/forms/editor/FormPage.java
setContainer(page);
		}
		
		public FormPage getPage() {
			return (FormPage)getContainer();
		}
		public void dirtyStateChanged() {
			getPage().getEditor().editorDirtyStateChanged();
		}
		public void staleStateChanged() {
			if (getPage().isActive())
				refresh();
		}
	}
	/**
	 * A constructor that creates the page and initializes it with the editor.
	 * 
	 * @param editor
	 *            the parent editor
	 * @param id
	 *            the unique identifier
	 * @param title
	 *            the page title
	 */
	public FormPage(FormEditor editor, String id, String title) {
		this(id, title);
		initialize(editor);
	}
	/**
	 * The constructor. The parent editor need to be passed in the