Bug 277873 [CSS] Exception handling for illegal color name
examples/org.eclipse.e4.ui.examples.css/src/org/eclipse/e4/ui/examples/css/editor/AbstractCSSEditor.java
/**
	 * Return selection index of CSS files widget.
	 * 
	 * @return
	 */
	protected abstract int getCSSFilesWidgetSelectionIndex();
	/**
	 * Return item count of CSS files widget.
	 * 
	 * @return
	 */
	protected abstract int getCSSFilesWidgetItemCount();
	/**
	 * Select item of CSS files widget at <code>index</code>.
	 * 
	 * @param index
	 */
	protected abstract void selectCSSFilesWidget(int index);
	/**
	 * Remove all items of CSS files widget.
	 */
	protected abstract void removeAllCSSFilesWidget();
	/**
	 * Add item of CSS files widget.
	 * 
	 * @param item
	 */
	protected abstract void addItemCSSFilesWidget(String item);
}