Bug 295981 [Forms] FormImages & FormFonts are not disposed correctly
bundles/org.eclipse.ui.forms/src/org/eclipse/ui/forms/widgets/FormToolkit.java
public static final String KEY_DRAW_BORDER = "FormWidgetFactory.drawBorder"; 
	public static final String TREE_BORDER = "treeBorder"; 
	public static final String TEXT_BORDER = "textBorder"; 
	private int borderStyle = SWT.NULL;
	private FormColors colors;
	private int orientation = Window.getDefaultOrientation();
	
	private BorderPainter borderPainter;
	private BoldFontHolder boldFontHolder;
	private HyperlinkGroup hyperlinkGroup;
		
	private boolean isDisposed = false;
	
	VisibilityHandler visibilityHandler;
	
	KeyboardHandler keyboardHandler;
	private class BorderPainter implements PaintListener {