Bug 264256 [CSS] Need margins
Build ID: M1 Steps To Reproduce: This code is a problem because it expects there to be a FillLayout on the parent if(property.equals("border-width")) { ((FillLayout) parent.getLayout()).marginWidth = pixelValue; }
bundles/org.eclipse.e4.ui.css.swt/src/org/eclipse/e4/ui/css/swt/CSSSWTConstants.java
/**
	 * Key value for setting and getting the CSS class name of  a widget.
	 * Clients may rely on the value of this key if they want to avoid a dependency on this package.
	 * @see Widget.getData(String) Widget.setData(String, Object)
	 */
	public static final String CSS_CLASS_NAME_KEY = "org.eclipse.e4.ui.css.CssClassName";
	/**
	 * Key value for setting and getting the CSS ID of a widget.
	 * Clients may rely on the value of this key if they want to avoid a dependency on this package.
	 * @see Widget.getData(String) Widget.setData(String, Object)
	 */
	public static final String CSS_ID_KEY = "org.eclipse.e4.ui.css.id";
	
	/**
	 * Constant used to store {@link CSSBorderProperties} instance into SWT
	 * control data.
	 */