Bug 205049 Other plug-ins should be able to define default content generator
Currently only the content generator can define which plug-ins it can be the default for - we need a way for plug-ins to refer back to the marker support for thier own generator.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/provisional/views/markers/api/MarkerField.java
}
	/**
	 * Create a FilterConfigurationArea for the receiver.
	 * 
	 * @return FilterConfigurationArea or <code>null</code>
	 */
	public FilterConfigurationArea generateFilterArea() {
		try {
			if (configurationElement
					.getAttribute(ATTRIBUTE_FILTER_CONFIGURATION_CLASS) == null)
				return null;
			FilterConfigurationArea area = (FilterConfigurationArea) IDEWorkbenchPlugin
					.createExtension(configurationElement,
							ATTRIBUTE_FILTER_CONFIGURATION_CLASS);
			if (area != null)
				area.setField(this);
			return area;
		} catch (CoreException e) {
			StatusManager.getManager().handle(e.getStatus());
			return null;
		}
	}
	/**
	 * @return The image to be displayed in the column header for this field or
	 *         <code>null<code>.
	 */
	public Image getColumnHeaderImage() {
		String path = configurationElement
				.getAttribute(MarkerSupportConstants.ATTRIBUTE_ICON);
		if (path == null)