Bug 266028 [CSS] Property retrieval must check instanceof and return null
bundles/org.eclipse.e4.ui.css.swt/src/org/eclipse/e4/ui/css/swt/properties/custom/CSSPropertyMaximizedSWTHandler.java
public static final ICSSPropertyHandler INSTANCE = new CSSPropertyMaximizedSWTHandler();
	
	public void applyCSSProperty(Control control, String property,
		    CSSValue value, String pseudo, CSSEngine engine) throws Exception {
		boolean isMaximized = (Boolean)engine.convert(value, Boolean.class, null);
		if (control instanceof CTabFolder) {
			CTabFolder folder = (CTabFolder) control;
			folder.setMaximized(isMaximized);
		}
	}
	public String retrieveCSSProperty(Control control, String property,
			String pseudo, CSSEngine engine) throws Exception {
		CTabFolder folder = (CTabFolder)control;
		return Boolean.toString( folder.getMaximized() );
	}
}