Bug 314475 Advanced button not working again
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/dialogs/CreateLinkedResourceGroup.java
variablesButton.setFont(locationGroup.getFont());
		variablesButton.setEnabled(enabled);
		setButtonLayoutData(variablesButton);
		createFileSystemSelection(linkTargetGroup, enabled);
		createResolvedPathGroup(locationGroup, indent);
		if (linkTarget != null) {
			linkTargetField.setText(linkTarget);
		}
	}
	/**
	 * Create the file system selection area.
	 * 
	 * @param composite
	 * @param enabled
	 *            the initial enablement state.
	 */
	private void createFileSystemSelection(Composite composite, boolean enabled) {
		
		if (FileSystemSupportRegistry.getInstance().hasOneFileSystem()) {
			return;
		}
		fileSystemSelectionArea = new FileSystemSelectionArea();
		
		Composite parent = new Composite(composite, SWT.NONE);
		parent.setLayoutData(new GridData(SWT.FILL, SWT.NONE, true, false, 4, 1));
		GridLayout layout = new GridLayout(2, false);
		layout.marginWidth = 0;
		layout.marginHeight = 0;
		parent.setLayout(layout);
		parent.setFont(composite.getFont());