Bug 203838 [Markers] [Markers] clicking on column headers does not sort table
I20070918 Clicking on any of the column headers does not sort based on the relevant column.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/provisional/views/markers/MarkerContentGenerator.java
*/
	public Collection createFilterConfigurationFields() {
		Collection result = new ArrayList();
		for (int i = 0; i < visibleFields.length; i++) {
			FilterConfigurationArea area = visibleFields[i]
					.generateFilterArea();
			if (area != null)
				result.add(area);
		}
		return result;
	}
	/**
	 * Return the id of the receiver.
	 * 
	 * @return String
	 */
	public String getId() {
		return configurationElement
				.getAttribute(MarkerSupportConstants.ATTRIBUTE_ID);
	}
	/**
	 * Return the markerTypes for the receiver.
	 * 
	 * @return Collection of {@link MarkerType}
	 */
	public Collection getMarkerTypes() {
		if (markerTypes == null) {
			markerTypes = new HashSet();
			IConfigurationElement[] markerTypeElements = configurationElement
					.getChildren(MarkerSupportRegistry.MARKER_TYPE_REFERENCE);