Bug 296565 Make group creation an advanced option in the folder
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/dialogs/CreateLinkedResourceGroup.java
* Validates this page's controls.
	 * 
	 * @param linkHandle
	 *            The target to check
	 * 
	 * @return IStatus indicating the validation result. IStatus.OK if the
	 *         specified link target is valid given the linkHandle.
	 */
	public IStatus validateLinkLocation(IResource linkHandle) {
		if (linkTargetField == null || linkTargetField.isDisposed()
				|| !createLink) {
			if (linkHandle.getParent().isGroup()) {
				return createStatus(
						IStatus.ERROR,
						IDEWorkbenchMessages.CreateLinkedResourceGroup_linkRequiredUnderAGroup);
			} 
			return Status.OK_STATUS;
		}
		IWorkspace workspace = IDEWorkbenchPlugin.getPluginWorkspace();
		FileSystemConfiguration configuration = getSelectedConfiguration();
		if (configuration == null
				|| EFS.SCHEME_FILE.equals(configuration.getScheme())) {
			
			IPath location = new Path(linkTarget);
			if (location.isUNC()) {
				return createStatus(
						IStatus.WARNING,
						IDEWorkbenchMessages.CreateLinkedResourceGroup_unableToValidateLinkTarget);
			}
		}