Bug 295981 [Forms] FormImages & FormFonts are not disposed correctly
bundles/org.eclipse.ui.forms/src/org/eclipse/ui/forms/widgets/FormToolkit.java
* 
	 * @param parent
	 *            the page book parent
	 * @param style
	 *            the text style
	 * @return the scrolled page book widget
	 */
	public ScrolledPageBook createPageBook(Composite parent, int style) {
		ScrolledPageBook book = new ScrolledPageBook(parent, style
				| orientation);
		adapt(book, true, true);
		book.setMenu(parent.getMenu());
		return book;
	}
	/**
	 * Disposes the toolkit.
	 */
	public void dispose() {
		if (isDisposed) {
			return;
		}
		isDisposed = true;
		if (colors.isShared() == false) {
			colors.dispose();
			colors = null;
		}
		boldFontHolder.dispose();
	}
	/**
	 * Returns the hyperlink group that manages hyperlinks for this toolkit.