Bug 126061 [Viewers] Need to document that virtual tables and trees ignore sorters and filters
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TreeViewer.java
ITableFontProvider fontProvider = null;
		ITableColorProvider colorProvider = null;
		/**
		 * Create an instance of the receiver. Set the color and font providers
		 * if provider can be cast to the correct type.
		 * 
		 * @param provider
		 *            IBaseLabelProvider
		 */
		public TreeColorAndFontCollector(IBaseLabelProvider provider) {
			if (provider instanceof ITableFontProvider) {
				fontProvider = (ITableFontProvider) provider;
			}
			if (provider instanceof ITableColorProvider) {
				colorProvider = (ITableColorProvider) provider;
			}
		}
		/**
		 * Create an instance of the receiver with no color and font providers.
		 */
		public TreeColorAndFontCollector() {
		}
		/**
		 * Set the fonts and colors for the treeItem if there is a color and
		 * font provider available.
		 * 
		 * @param treeItem
		 *            The item to update.
		 * @param element